You can use that 55 if you have not used any copper treatments in there. You can likely find someone on this forum that uses an UGF in their reef, I bet. Also, many run natural tanks with no drilling, or sump, or skimmer. You can make your own rock, save money doing it, and eliminate bringing in some nuisance pests that could come with live rock all at once. You can even light the thing with normal output fluorescent bulbs. A 55 is pretty shallow, so high powered lighting is not as critical as it would be in a deeper tank. Take what you hear with a grain of salt, do a lot of studying, go slow, and enjoy yourself! You don't have to have all the latest gadgets to have a reef tank! BUT, when someone tells you to use RO/DI water, they know what they are talking about!:nod: