Lighting for a 15 gallon column tank
I have a 15 gallon column tank that came in a kit. The only light I've found to work with this setup is the 12" Aqueon Full Spectrum Daylight T5 which is only 8 watts. The fish tank is only maybe 13x13" and from substrate to waterline is about 18".
Currently I have two amazon sword plants, a bunch of wisteria, a java fern, some sort of anubis plant and a moss ball. I also have laterite mixed in the gravel. I also have 7 harlequin rasboras.
I would like to add more plants as I go along but I'm not sure which kinds.
My plants seem to be growing ok but I've only had it up and running for 2-3 months. Is this light enough to keep them growing well or any suggestions on how to improve the lighting?