Hello there. We're always welcoming customer feedback. Hence us bringing in a 30" Ray II. The 20" Ray II has brought up before but at the moment, there are other fixtures in the works ahead of the 20" you suggested. I'll surely keep ya updated.
I just purchased the 24" Finnex Ray 2 in 7000k for my 10 gallon. The sliding legs are adjustable and I have it set up right now. It does hang a little on the sides, but it does work for what I need it for.