i would do co2 if i had the watts to match. and its about 3ft from top to bottom.
i did get the additional light for the spot on the hood. so im 30w over a 55g hex.
my plants i have and would like a lil more out of are:
foxtail- 5-6 stems about a foot or more each- not very bushy
wistera- 3 stems same height^ shooting to the top
java moss- golf ball - hasnt grown at all
moneywort- 3 2-3" peices no growth- 2-3 died already
moneywort- no wicked growth everyone talks about
some val- no growth its slowly goin dead
micro sword- 2 days old, no news
anacharis- 4-5 stems, 1-2ft and looked really bad after i put it in, leaves got clear. now it looks like it might be coming back? i dunno yet.