Hi everyone i was just wondering if you could help me my redtail catfish is not eating. we have tested the water the nitrite, nitrate are zero, ammonia is zero put the ph is a bit low. We have been doing regular water changes and been putting in ph stabilisher but its not working. He is in a 6ft tank at mo put building a pond for him. He is 22 inchs long and he normally eats sprats but hes not interested at all hes swimming round as normal but not interested in food at all any answers would be appreciated thanks dot.