i had 2 greenies b4
change 30% water per week, straigh tap water is ok, ph around 7.5...temp around 80 is ok.....make sure you have current movement in tank ie powerhead
remove all sharp object from tank ie rocks, drift wood to prevent drop scales
make sure tank has glass top and no holes on top of tank.....they like to jump out if they holes are there
fastest way to bulk up is sw
for my Super Red, i use frozen sw, break in half and stuff sw with hikari sticks after thaw.......i'm sure greenies will like this too
be careful with live sw and crickets.....crickets are very addictive.....u might have hard time to ween them off crickets into mp
earthworms are good too but don't pick them from ur lawn if u fertilize
i feed my big rtg with mice and smelts.....this might be other options for u once ur greenie gets big
.......good luck