Coral/Water chemistry question for beginner!

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Coral/water chemistry question.  My tank has been cycled with Dr Timms, I have 4 small damsel fish, a couple of clowns, CUC and some small coral frags - the fish are fine, but the corals aren't doing too well.  The 2 Zoa's are fine, both open quite happily, however the Montipora isn't looking so good - going white at the edges and losing some of its color, the green star polyp opened the first couple of days and has been shut since and the pulse polyp the same.  If I've done my research right these should all be fairly hardy beginners corals?!

Lights are a pair of AI 26's set to ramp up/down for an hour morning and evening and then lights on for 11 hours, everything set to 60% apart from green and red which are off.
Water readings are:

Salinity between 1025 and 1026
Ammonia 0.001
Nitrite 0.1
Nitrate 10 (that needs to come down I know - algae reactor will be up and running tomorrow which will hopefully sort that pretty quickly)
Ca 500
Mg 1500
KH 8.1

Are Ca and Mg too high?

Soft corals have been in for about a fortnight, SPS for just under a week.

Any suggestions appreciated....

ajm83

  • Andy
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Reply #1

Nitrate at 10 is alright IMO, what's your phosphate reading?

Have cal and mag gone over the max level of your test kit?

What are you using to check salinity?

Aside from the above, what I would say is that usually SPS (like montis) usually require good stability and a mature tank to thrive, and will often take some time to adjust to a new tank. 😊

Nathanb

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Reply #2

Thanks,  phosphate I havne't tested yet, salinity is a refractometer.  I do have a phosphate reactor in the sump and the media is almost new so I'm assuming that should be ok.


Algae reactor will go on tomorrow too....

ajm83

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Reply #3

Phosphate can be too low, that will cause pale sps. 

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Nathanb

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Reply #4

Ah ok - didn't know that!  I'll add phosphate test kit to my shopping list! Thanks for the heads up

ajm83

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Reply #5

Ah ok - didn't know that!  I'll add phosphate test kit to my shopping list! Thanks for the heads up

Here's a tip,  don't get a Salifert one, I've never ever had a reading on mine. Once I got a slight blueness to the sample, but still nowhere near the actual first reading on the card.

I'd recommend a Hanna ULR (expensive but accurate), Elos HR (quite expensive), and the new Red Sea Phosphate Pro test (not the Phosphate test, must be the Pro).

Thanks:


Nathanb

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Reply #6

Thanks Andy - I was planning to go with the Red Sea Pro as  all the rest of my kits Red Sea (apart from ammonia and PH which is picked up by the Seneye)

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