I HAVE 120 SOUTH AMERICAN TANK, AND NO MATTER HOW MUCH I CLEAN IT THE WATER SMELLS BAD, I HAVE 3 POWER HEADS AND A OUTSIDE CHARCOLE FILTER, WHAT CAN I DO TO GET RID OF THE BAD SMELL? SHOULD I ADD ANOTHER FILTER WITH MORE CHARCOLE?
ITS 120 GALLONS, I CHANGE HALF THE WATER EVERY 2 WEEKS, VACUME ONCE A MONTH, 1 BIG OSCAR, I PIKE, I GREEN TERROR, 1 JACK DEMPSY, SPINEY CAT FISH. IT SMELLS LIKE FISHY MOLD, I THOUGHT THE WOOD TOP WAS ABSORBING MOLD SO I REMOVED IT AND IT STILL SMELLS SOME DAYS ITS WORSE THAN OTHER DAYS
Do you have a dead feeder stuck between something or under something where your fish could not get to it? Check your ammonia level to see if that's high. Also Oscars are real messy and have a lot of poop and if you other ones are large as well they may have a lot of big poop. If your ammonia level is high it may mean a dead fish somewhere -or- you could have a spot with a lot of poop collected, maybe a spot you cannot really see or get to. They dig pits so there may be a pit somewhere with poop collected in it. This could cause an odor easily and can become fatal if the ammonia level gets too high. If either dead fish or poop you need to get it out of there asap because water changes will not even help because it'll foul back up in a couple of days again until the mess is removed. You may need to move rocks and other decos away to check.