Give fox a break. He's new here, don't turn him off to forums. I know I've been guily of multiple posts every now and then, and it's just because I think of new things. This guy is new to the hobby so give him some slack guys!
Fox, I have successfully kept BTA's under T5's without problems. It can be done. Also, if you target feed (i.e. with a turkey baster) then make sure you don't do it too much.
I have kept a total of 4 anemone's during the course of my experience in this hobby. My very first anemone was a BTA and I target-fed it once every few days and it just made him mad... he was always moving behind the rocks. I finally went to my LFS and talked to the owner of the store. She's an older lady, and has been keeping SW fish for the 150 years she's been alive. Ok she's not that old, but we're talking a LOT of experience here. She's probably in her 70's and their very first SW tank was a wedding gift to each other when they married in their early 20's. Long story short, she knows her stuff.
ANYWAY, she told me that the best way to feed your anemone's is NOT to target feed them, but instead constantly keep your water filled with phytoplankton... you can buy a bottle of it in the store and a capful every few days should be enough.
Anyway, since I've been adding phyto and NOT target feeding, all 4 of my anemone's have done awesome, and are very happy in all of my tanks.
I have kept anemone's under compact fluorescents and they will not live... I had to nurse one of them back to health because a buddy of mine bought a LTA for his 14g biocube, and it was terrible. The anemone got really pale and brown...
But T5's are sufficient if you put him high enough. I have a 30g with two double-bulbed T5's and my LTA is doing awesome.
But I would agree with the others that you probably should add more live rock... just make sure it's cycled!
Lastly, as for water, you can get that at pretty much any local fish store. They should keep both RO water and salt water for you to do water changes... most stores are pretty reasonable too. My store charges $.29/gal for RO water and $.79 for Saltwater. Some stores charge a bit more though.
