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Frozen brine shrimp and nitrites

I bought 20 cardinal tetras the other day and lost most of them before 24 
hours had elapsed. Since my Red Sea test kit reagents were no good, I took 
a sample to the LFS and they found very high nitrites. This really 
surprised me, since the tank is 75 gallons, heavily planted, with a Fluval 
304 canister filled with 4 of the foam blocks. I believed I had a large 
biological filter.

I have not noticed any expired fish or snails, although most of my fish are 
small tetras and cardinals, and I don't always notice a carcass until is 
has been reduced to bones. I did experience a rather nasty algae outbreak a 
week or so ago. I guess this should have been a warning sign.

I feed frozen brine shrimp 3 or 4 times a week directly into the tank. 
Would this cause the nitrite level to rise? Should I thaw the shrimp in a 
small container of water and strain off the resulting liquid before 

Douglas Guynn
	dguynn at nwol_net

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