Believe it or not, I have had great luck with Sylvania daylight and
Philips
Alto Series Daylight Fluorescesnts (Available in lighting sotres and Home
Depot) I have 23 tanks that hold plants for my business and they seem to
work well---not to mention they cost about $6 each. For the 20, I suggest
eh Sylvania F15-T8 Daylight.

Sorry to intrude, I hardly ever post on this group...

But, same experience here with the sylvania daylight tubes. Cheap, nice
color rendering (not super, but nice) and the plants do fine under them,
Java Ferns included.