Vinh;

Unless you already have the eclipse hood, I would recommend using the 30" hood from Ah supply with 2 55 watt PC tubes. I had a 29 with an eclipse, then did a mod on it from inlandreef.com. This put 2 55 watt PCs in the eclipse hood. The difference was amazing, but after about 6 months the PCs melted the plastic shield on the hood. So I gave up and bought the DIY hood from Ah. Their reflectors really help. For water movement, a powerhead will move as much around as the eclipse. I'm pretty sure that the Ah set up is about the same cost as the eclipse; WAY better light.

Here's a thought; if you have the eclipse already, try replacing the NO tubes with VHOs and run a remote ballast. I'll bet it will work better than the PCs. You'd have to scrounge for a cheap ballast to drive the VHOs, but the tubes will fit better than the PCs and because of this, maybe not melt the plastic. If it works, alot of people will be interested....

My E.quad is in a 10 gal under 2 36 watt PCs. It likes the light.

Matt