nice thread...
I use a 18w CF on my 5.5
http://www.jlaquatics.com/product/pc...t+Fixture.html
It fits PERFECTLY on a stock 5.5 if you take the top trim off.
evap was a concern at first but then a 2L coke bottle set at a slow drip as an ATO fixed that pretty quick.
Works great, have zoas, shrooms and some softies...
Bet yours winds up being prettier though.
following along.