A T-5, NO with a good reflector would get you up into the 'needs some fertilizer, and Excel' range, but even the slower growing plants would do a lot better with that.
I'm having trouble finding single strip T5 fixtures that aren't high output. Both Aqueon and Coralife offer dual
fixtures with two 18W T5 bulbs, but wouldn't 36W be too much over a 20 gallon aquarium? Would running a single 18W bulb in such a fixture be preferable to a 20W T8?
Originally Posted by somewhatshocked
About substrate... are you set on Flourite or gravel?
I listed Flourite only because I'm familiar with it, but perhaps I should investigate better options for substrate.