block head
New member
Tom is Mr smarty pants. I look for poop. Organic chemistry hurts my head. Chances are, you have poop in your rock ,or the sand bed. If possible, take the sand out temporary. Get in there, clean up the funk. Sand is pretty cheap to replace. Rock is easy enough to cook. Water changes shouldn't sting too much. I'm always amazed at how much filth comes out of "clean" tanks.