One of my male orange tail endlers died yesterday it was really bloated and couldn't swim properly, it was like his stomach was full of air, now my other guppies and endlers are swimming constantly on surface and only coming down to scratch themselves on an ornament then return to the top, they are not eating!! I am treating the tank with anti internal bacteria and tonic salts as instructed by my local fish shop, The tank is a 20 gallon with internal powerflow filter temperature is 80 degrees ph 7.6 ammonia 0 nitrite 0 nitrate 10 has anyone ever experienced this??
Thanks in advance. Mark