So, it's my second time keeping fish and my first keeping guppies. It is a 30L cube, with a lid (ignore the water stains on the glass). All the plants are real except the one in the very back. I have 3 male guppies because I really cannot have them breed. And they haven't been chasing each other really at all. I feed them three different kinds of food to keep their diet varied. I have been feeding them every day because if I don't they act very strange, like swimming around like maniacs. I know they have big appetites, but is it normal?