I went to bed last night and everything looked fine and i woke up and two junville chinese algae eaters and one juvenille red zebra cichlid were dead . none of the other fish are aggressive to one another beside one of the chinese algae eater chaes one of the others one around but nothing major plus i dont think he could of killed the reb zebra juvenille. I checked the water and everything looked normal. I just finished treating for ick and non of the fish that died had gotten it. Now i just noticed that my two baller sharks are up at the surfacegasping for air non stop and some other fish are doing this also. I have an air stone in the running all the time so it not a lack of air. Whats going on guys?

What did you test the water for and what were the results?

i tested for nitrite, nitrate, ph, kh, gh ph was 6.8-7, nitrite and nitrate both almost zero, kh 40 ppm, gh 75 pph oh yes and i did a 50% water change last ight bc i just finished the treatmentfor ick but the water was not different than what i usually put in there and i also just added he carbon back in the canister

do you use tap water? if so are there any rd works close to you? it may be the water has been contaminated from source? do you use dechlorinater? maybe with ick meds + dechlorinater could have been a reaction? can you get to a LFS that does RO? if so go + get enough to do a 50% WC add another airpump if poss'

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i used the tap water and yes i used decholrinator and i do not know what a rd wroks is.

rd works= road works, ie digging up the road

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If the fish are gasping at the surface it is oxygen defficiancy,also the nitrite should be zero.Did you put carbon that had been used already back into the tank as it would absorb the meds you were using and could throw back toxins into the water.What filters are you using and what is the size of tank and stocking levels.

No i do not believe they are digging up the road anywhere, no the carbon was brand new. I am using a fluval 305 external canister, the tank is 55 gallon and there are 8 fish in there right now there were elvel but three dies last night

I would try to increase the air supply to the tank,I dont have any Fluvals but I think they have a venturi return not a spraybar,try and raise the outlet so it splashes across the water surface.

i dont use tap safe etc chemicals , try all above also get a 5 gallon bottle run tap for a while , fill up then leave by radiator for 30 hours then add to tank. the chlorine , fluoride and other crap works its way out.much better than adding more crap to recyc