CO2 advice?

[trilinearmipmap]

If you want high light, PC will be more than adequate. For a 30g tank one length of PC bulbs will be fine.

I suggest you check out www.ahsupply.com if for an excellent pc setup with 6500K bulbs. Depending on the length of your tank either a 96W (36") or 55W (24") bulb would do the trick. I have 4 x 55W on a 75g tank and I am looking at downgrading my lighting because the plants grow faster than I can prune them.

I do not suggest MH due to heat issues and due to nutrient imbalance/algae issues.