Well you need to decide if you are going to use CO2
Either way I would suggest a 48" fixture since they are normally reasonably priced and common.
If your not using CO2
then you want ~2wpg of T5HO at most. So a good fixture for that would be this (they just upgraded these to have better reflectors so if you can wait a little bit you will be more guaranteed to get the new model)
If you want to use CO2
then this is a good deal:
You can do OK with a single 54w T5HO fixture also for lower light plants(but I would still reccommend a 2 bulb fixture and you could just use 1 bulb to start). Many people in the past have used shoplights with good success on 48" tanks also.
Personally I bought the best 48" T8 shoplight I could find(sold at Menards onsale last I knew for $20) and bought a new 4 bulb ballast to "overdrive" the 2 bulbs with extra watts.
10G,Planted- Endler's Livebearers+RCS, 55G,planted
Originally Posted by Kurt_Nelson
Understanding the basics will let you make informed decisions on what advice to follow, and what advice is just plain hooey!