Poop like that is not normal it sounds like spironucleus. There is a thread on here about treating it with Epsom salt I'm going through it with good success. Beef heart is not very good for fish, hard for them to break down if you are going to feed it - it should be much less frequently a good pellet will go a long way.
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can u please post the link so i can know the ammount of salt ... my GT has also this issue

