I've always admired them, now I am thinking about getting some. I have a 75g tank. Right now it's full of shrimp. I'll be moving the shrimp out and into another tank. Filtration will be handled by a couple canisters and a large HOB (AC 110) so that should be covered. My question is, what's the max number I can have in the tank as adults without crowding? I'm thinking 3-5. Also, is it better to keep them in odd numbers or does it matter? Last one, once I am able to setup a larger tank in a few years, how difficult is it to introduce more fish to the pack? Thanks.