Dosing pump

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Hello,

I would appreciate some guidance with a dosing pump. Having checked few threads I'm puzzled should solutions such as Mg+ be mixed with RODI water, salt water or maybe dosed as concentrate? When the water evaporates we top up with RODI with good reason behind as the salt stays in the tank. But adding additives mixed with just RODI water would affect salinity IMO, isn't it?  Let's say over time I would add 3 liters top without salt, 1 liter of Mg solution, 1 of KH solution and 1 of Cal solution. That must affect salinity.

Also dosing itself, QFI states 10ml of concentrate for 100L twice a week (putting aside my tank real needs for now just to make it easier). Ignoring sand & rock impact on the water volume with filter & skimmer I say I have 63L so 6.3ml of Mg+ concentrate twice a week must get into the tank. Is there any rule for dosing pumps for proportions/ratio or it's a free call? I can prepare 1L of solution, 25.2ml of the concentrate dissolved in 1 liter of water gives me 4 doses of 250ml per QFI suggestion, 500ml needs to be added every week. Should I dose less but increase concentration - 63ml of the concentrate per 1liter giving me 10 doses of 100ml and then only 200ml needs to be added every week?

Where I'm coming from with these cheap pumps I'm sure accuracy is not the greatest 100 or 250ml of solution vs. 6.3ml concentrate makes it much more prone to errors.

Regards,
Mariusz

Mike

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Reply #1

Hi,

You can't mix your supplement chems into saltwater, as saltwater is made up of other chemicals that'll react with it.

For instance, you can't put sodium bicarbonate solution in the same container as calcium carbonate solution (for increasing alkalinity and calcium levels respectively) as they'll instantly bind and form calcium carbonate powder. It'll turn to milk and settle to dust.

Also, when dosing, most pumps will wait a short while between dosings, to avoid chems being dumped into water that's already high in concentration of some other chemical it might react with.

So you mix your solutions up with RODI water and keep them separate. Your dosing will very slightly reduce the amount you need to top up with, as obviously your solutions are from RODI which will replenish evaporation loss too, but it's only a tiny amount, so you still need to top up normally with RODI too.
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Mike

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Reply #2

You need to not dose for a couple of weeks before you do, so that you can measure the rate of consumption. If magnesium is consumed at 50ppm a week, you can then do the maths based on your water volume and how much mag you dissolved into your litre of RODI to work out how many MLs of your solution you need to dose daily to keep up with demand.

There's handy dosing calculators that do a lot of the calculation for you.
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mmx01

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Reply #3

I have 3 separate containers for 3 separate solutions and a 4 channel pump to be on a safe side, it was not my intention to mix all 3 elements in one ;) also the pump has an option of dosing delay between channels. However I could still control two variables concentration and amount of solution to be dosed is it better to have higher concentration and a smaller dose (less water) per solution or opposite?

Regards,
M

Mike

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Reply #4

It doesn't really matter so long as you know the concentration.

More concentrated should save wear and tear on the dosing pump. Concentration to saturation though and you'd want very fast water flow in the chamber that it's dripping into to avoid localised reactions with the drips.
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mmx01

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Reply #5

In the mean time I guess the cycle is completed and I could start slowly stocking with CUC after lowering NO3. A small one at first as there's not much to be done few turbo snails + a shrimp, is a fire shrimp picky on food/demanding?

1st of Nov added ammonia (no live stock) concentration spiked to 0.8ppm, 4th of Nov ammonia reads 0ppm, NO2 reads 0, NO3 reads 20ppm some life form has established in the tank.


HK_Fuey

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Reply #6

Yes, you're cycled.

Fire shrimp are not picky, they'll eat anything.  Great clean up crew.  Get a pair, and you'll see them more.
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mmx01

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Reply #7

Well I've done 20% water change today and to my surprise NO3 has not dropped a bit?  :scared:  This development had crossed my plans of going to LFS and stocking the tank.

Tested the water coming from my RODI and it reads TDS 0 and NO3 0 so I'm sure the water source is not to be blamed. Will do another 20% change but I'm not sure what is raising NO3 since there's no NO2 it's not from the bacteria, no other live stock, no food nothing else in the tank yet but coralline algae which should consume NO3?

Mike

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Reply #8

You won't see nitrite again. Your cycle is complete and so any ammonia will be dealt with and nitrite dealt with so quick it won't be readable and will end up nitrate.

There's no need to feed the shrimp specifically, but if you do, only the tiniest amounts as you want them to be pruning any decaying matter from around the tank.

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mmx01

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Reply #9

Two trochus snails and a cleaner shrimp found their new home. One of the snails prefers the rock while another one is a glass climber. Having  checked the water again I noticed significant drop in Ca levels... from 460 to 290 the only thing which could consume Ca is coralline algae apparently it looks dying (turning white), is there a way to save it?

fr499y

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Reply #10

water changes to bring the cal back up ( or dosing if you want to go that route )

mmx01

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Reply #11

Good afternoon,

S 1.024
pH 8.2
KH 11.9
NH3 0
NO2 0
NO3 5
PO4 0 (I ran a high resolution version of the test to be sure... looks like PO4 remover in the canister works)
Ca 410
Mg 1520

Takes quite a bit to run all these tests ;) I noticed brown hairy stuff on the rock capturing air bubbles probably brown hair algae how is it spreading with no phosphates? CUC reinforced with four additional Turban snails and two Hermit crabs.

fr499y

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Reply #12

if its brown, stringy and air bubbles, might be dinoflagellates. Think of brown snot with air in it.

mmx01

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Reply #13

Seems like that's it. Not spreading like crazy but the rock is a bit brown-ish with bubbles trapped here and there. Snails are on it while two small hermits addressing the substrate. View is not pretty but not like on some of pictures I'm guessing thanks to RO/DI, heavy skimming and PO4 absorbing media since day 1.

Maybe on dosing again. The tank is still very young so I'm trying to establish how much it consumes and don't dose anything yet but since I introduced few new inhabitants (and they came with a good amount of their water) so far it's a running target.  From this week after the water change I will measure at 3 points Day 1 - Day 4 - Day 7 and check how levels are dropping and get dosing going.

Regards,
Mariusz

HK_Fuey

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Reply #14

It's new, so you will go through a few algae outbreaks until everything settles.  You'll also see levels of different critters rise and fall...such as pods, brittlestars, worms, etc as food sources for them rise and fall.

What I'm saying is, your levels are fine, so just wait it out and trust it will all fall into place.
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