So my dad wanted a fish tank for his birthday/father's day. He wanted a betta and doesn't have a lot of room, so I got him a marineland 5 gal starter kit with a tetra heater and I'm cycling it right now. The problem is, he wants to put some neon tetras in there with the betta. I'm A beginner myself, having only had my fish for about a month, but I'm pretty sure neons need a 20 gallon minimum and are notorious fin nippers (correct me if I'm wrong please). He kept neons when he was a kid/teenager, in tiny tanks, so I'm having a hard time convincing him that this is a bad idea. I tried selling him on some shrimps or a snail but they're "not as exciting." I know that, ultimately, he'll do what he wants, but I'd feel bad if I didn't try my hardest to convince him not to put the neons in there. I guess my question is, how do I convince him that neons do not belong with a betta in a five gallon tank?