So I have a 13 Gallon tank right now with 4 fish in it. I was thinking after they all pass on, I would get some silver tip tetras, and also redesign my tank. My main question is how many silver tip tetras could I have in it for a nice sized school that’ll also fit well in the tank? And, if possible, could I get some sort of bottom dwelling fish to hide in places. I’ve always liked having those types of fish. Thanks!