just upgraded tanks for two irredeccnt sharks a sephleypod giant catfish, a dragon eel which died along with about 4 bala sharks and 3 columbian sharks and a black ghost knife. Ph levels were high checked ammonia levels were even higher. note i am only caretaker of my roomates fish, i dont know exactly what to do but have been looking up directions on how to fix this problem. I dont want to see the fish die i think their cool. Tried to lower dangerous levels of ammonia with 25% water change and anti ammonia tabs from tank buddies and some amquel. Several of the balas contracted ick along with the columbians. Recently seperated the last ick survivor which is a bala in the 65 gallon alone. Trying to fill the tank now just felt had to get him out if hes going to die anyway i dont want him infecting the other fish. Added some quick cure for the ick and wanted to use this lifeguard all in one treatment by tank buddies but it says you have to remove the carbon from my filter canisters and run them without it but i dont know how thats going to affect the filter canisters or if it would affect my tank and the water i dont know but i dont want my fish to die they are very hearty one convict cichlid 2 grommees and a bunch of little fish my roomated dumped in there last week which from my research i found is what is killing the fish. Too many fish at once and the aquariums ecosystem cant handle all the crap they produce and homeboy get anxious and starts overfeeding dumping ghost shrimp in for the sharks and now all heck breaks loose and the fish start dying by the threes. Please help me need advice like quick, got a full bottle of amquel, tetra aqua and two extra tanks a 35 gallon octagon tank and a 65 gallon rectangle. Also found that the water that comes from the tap behind my fridge thats connected to a brand new water filter for the fridge produces water with 0 levels of nitrite and nitrate and moderate levels of ph and alkaline.