All you need to buy is a glass cover. They are fairly inexpensive, depending on the size of your tank. Even if you dont upgrade your lighting a glass hood will transmit the light better then a plastic one and are easier to clean.
80 gallon FW
:3 clown loaches, 2 angels, bloodfin tetras and 1 albino BN pleco,1 Farlowella.
46 gallon FW
: kuhli loaches, otos, black neon and black phantom tetras, 3 pitbull plecos.
50 gallon SW
: 1 green spotted puffer