Well i was suggested using a 100 watt mh bulb for my 29 gallon tank. Off hand it sounds like a it is a bit powerfull but I'm open to the possibility. Question is are there hoods or lights readily available in metal hide or is it a custom build it your self project. Also what about something like 75 watts? And what do these cost? And where do you get them from? The local aquarium stores do not carry them and act dumb when I ask about them. dennis