please give me some advice

[sky]

hi steve,

first of all, i would like to thank you for your detailed explanation so i have a clear mind now. luckily, i haven't bought that set yet; otherwise, i'll have to stick with the daylight bulb, but i just wonder why would someone willing to buy an ballast that only fits one type of 65k bulb when the rest of the ballast are compatible with most different brand name bulbs. (65k-140k)?

also, i would like to ask u the advantage or disadvantage of using the regular ballast/bulb n the HQI ballast/bulb? oh yeah, will u suggest me to get the double end bulb since it's becoming popular (beside the money issue) n what's the advantage of it? is it really better than the ordinary bulbs? i really want to learn more about it. oh yeah, so what u ar saying 250w is enough ea? (mine is 90gallon) cause i was thinking of the 400w, but i don't even know if i'm looking for too much...all i want is starting to try the hard coral n clams.

thanks,

sky