FISH QUESTION!?!?! IS THIS OKAY!?

Leave out the pleco, or get one that only gets 3 inches at most. Neon tetras are schooling fish and need to be kept in groups of 6 or more. Bettas can live with other fish but i would not recommend guppies. it really depends on the betta but a lot will attack guppies. If i were you i would get 1 betta and 6 tetras and leave it at that. Common plecos get 2 feet long and should not by any means be kept in a 10 gallon tank.