I just acquired a 55gal (4ft long) tank to set up in my classroom. I don't have a lot of money to set this tank up so any cheap options are great. I'm going to do a fishless cycle so I have a while to figure out stocking issues. What I'm wondering now is: 1) It came with an undergravel filter. Should I use it or just get a good filter (I'm thinking Ehiem classic 2213 canister) or use both? 2) I'm picking up a basic lighting fixture today(donated for the cause). What kind of bulb should I get if I want to have it pretty heavily planted but I don't want to use CO2. 3) Substrate suggestions for a community tank? I've been hearing a bunch about "Chicken Grit". Anyone ever use that. 4) It came with a 100 watt heater, is that powerful enough? That's all for now although I'm sure more questions will come up as I get answers for you guys. Thanks a lot for your help.