Ok im getting a 55 gallon tank with clown loaches, tiger barbs, and a angel fish, so i want some plants not alot but some for looks and some shelter for the fish .. my question is it needed to have a ugf? and if would i benificial to use a powerhead to help suck everything fron underneath the gravel.. and with only say 5 to 6o plants do you need co2 machines?