I've been setting up a new 30 gallon planted tank. The current inhabitants are: 2 cory cats, 1 common pleco, 3 puffers, 2 iridescent sharks(coming soon), 7 fish( I think they're platy's ). Would I have any aggression issue's if I added a school of 15 or 20 neon tetra's? My puffers are the only...