What did you top the dirt in the tank with tannins? I have found river sand to be the best. I got it a landscaper co $3 for a 50lb bag. Doesn't need a lot of rinsing and stays clean. Also the color is brown.
Eheim filters are my favorite for they are so quiet. Some don't last long though.
I've seen Purigen online for WAY cheaper than that, but yea check it out it'll make your water crystal clear.
I had the Dwarf Neon in my 29G. It was just barely enough room for them, for they are fast swimmers.
I think threadfin rainbow would work in the 20G. For minimum size tank for them is a 10G.
So you had those rainbow in a 55G last year. Did you downgrade to a 20G long? Why did you go from 55G to 20G?
No, I had a 55 that had 6 bosemani rainbows in it. These are new turquoise in this tank. I parted out the 55 last year to build a marine tank. Then I got tired of the marine thing, and went back to the small 20g long planted.
I have some runners of Jungle val. My needle leaf ludwigia melted in just a few days. No noticeable growth of the crypt, DHG, or microsword.
FTS: 11/28/2012 (Still have my ACs on there. I'll probably take them out this weekend. I already put the bio from the ACs into the Eheim 2213. I also plan to move the heater to one of the ends and not on the back wall.