Copepods or the like??

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Hi guys

I've noticed a couple of time since establishing my tank (+/ 3months) my fish seems to go mental in the tank on some nights.  Almost like they at an all you can eat buffet. 

I'm guessing they munching down on live food, but how is it that I seem to have so much of it without introducing it to my tank?  Could it be that my "2nd hand" live rock had enough of them live through the transfer that they've managed to establish themselves?

Or!  am I completely wrong on my guess that these things in my water column are copepods or the like, and are actually sinister in some way  :S

https://youtu.be/pPenvo7kx_c

A bit of tank info, 300 litres with about 60 kg of rock (45 live + 15 base).  I've got one large bit of live rock in my sump.  This is purely because I couldn't get the bugger to sit properly in the DT and had nowhere else to put it...  I hate wasting things....

TIA

Shawzy10

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Reply #1

I would think that could be the case. Copepods can survive in some weird conditions and temperatures. They become more active on rock work at night. If you wait for the tank lights to go off in the evening and give it about 30 mins or so then use a light like a small flash light or phone light and shine it on the rocks( try not to spook fish though!!) you will probably see them scramble about.

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Shawzy10

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Reply #2

How did you get on, did you see them scurrying around the rock??

svanjo11

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Reply #3

How did you get on, did you see them scurrying around the rock??
Lol, that's what I'm doing right now.  Hubby has a couple of headlamps, one green and one red.  Seems like the red one is better as it doesn't startle the inhabitants as much as the green...

I'm now wondering about the UV filter I'm running for no other reason other than it came with the setup. 

I've tried turning it off but within 24hrs but tank water was cloudy... Turned it back on and it cleared within 12.   Thoughts?

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Shawzy10

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Reply #4

What type of water are you using?? Straight from tap or RODI?

svanjo11

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Reply #5

RO water.

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Shawzy10

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Reply #6

Sounds as though you have a bacterial problem in the water column. If you are making the water I would be careful how you store it. Also add a DI filter  to Reduce silicates further. If you are getting it from LFS then I think more than likely you have something breaking down in the tank causing the bacteria to bloom. It can pass on its own in a week or so. I don’t use UV so I can’t comment on that but it sounds that is what is keeping it at bay.  I would do some water changes to try and dilute it down and watch what your feeding and the amount.

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svanjo11

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Reply #7

I make my own water, usually the day before and store it in plastic brewing containers.  Personally, I'm not aiming for 0 nitrate as I've got macro algaes which appreciate a bit and some softies

I've only tried turning the UV off once and my tank was probably just finishing it's cycle, so I'll try it again and see what happens...   

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Shawzy10

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Reply #8

Just give it some time and see if it clears up. Is your skimmer running ok collecting crap etc...?

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Ratvan

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Reply #9

Did you do anything to the sump before you noticed this? Mine get a free feast whenever i clean my back chambers (monthly as I feed heavy and dont skim) from teh pods that live back there

svanjo11

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Reply #10

If memory serves me right, I think I dug some of my macro algae into the sand bed a bit as my snails kept knocking them over...

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svanjo11

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Reply #11

Just give it some time and see if it clears up. Is your skimmer running ok collecting crap etc...?
Yeah skimmer is all good.

I've had the UV turned off for a day now and all seems fine...

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Shawzy10

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Reply #12

Probably killed it off...result!

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svanjo11

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Reply #13

Day 4 and still no cloudy water.  Result!

Next question, if you use a UV filter, why?


TIA

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