Hi, as i was getting ready to leave today I noticed that the poop of one of my goldfish appeared to be red and quite long. He, and his friend, live in a 26 gallon tank. The ammonia levels are 0, and I'm not sure of the nitrite and nitrate this second, but 25 % of the water is changed weekly, with a few small changes in between,
Any ideas of what the problem could be?
Any ideas of what the problem could be?
