I have a 65w power compact
actinic, a 10k 65w power compact and a 150 retro kits 10k
MH. That right now is a challenge to mount and still have room for your arm and rocks. Oh yea i also have a 29gallon. I would recommend using a 150, the heat from that is pretty great and my corals love it! I run my
actinic for 12 hours a day my 10
PC for 10 hours and my
MH for 5 hours a day.
I also agree with not covering the tank. The reason they say that is because if your
MH has been running for awhile and you reach your arm in the tank ( which i wouldn't recommend while the
MH is on) and you splash the bulb the bulb might bust and shock or cut you. Theres a lot of heat coming off those bulbs and i make sure my hood is shut when the
MH is on.