This started a few months ago. I have a wc ansorgii ~12" and a black volta endli ~10". I received these guys from JA sometime in January this year. The BV was 4" and the ansorgii was 7" and until recently, they've been hogs when it comes to eating. They would always look like they were about to explode. But a few months ago they both suddenly stopped for about a month. There were no changes done to the tank at all, I did regular weakly 70-90% wc's and they are the only fish in a 50g. Temp is ~84.5F, ammonia and nitrite are both 0 and nitrates have never gone above 10ppm. Filtration is done by an ac110, fluval xp3 and DIY k1 moving filter using a 2L soda bottle. Extremely overkill on the filtration, I know. When they started eating again, it was barely anything at all and still is. I still haven't even seen them eat. I have to throw the tilapia in and leave it overnight, only a few pieces, and only some of it will be gone. What could be wrong with them? The ansorgii definitely has lost some weight but not dangerously thin at all. Just thinner than it used to be cuz it used to be extremely fat. All advice is appreciated and if you guys need anymore info just let me know.
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