slow grow

10g Anubias afzeli A. congensis A. frazeri A. hastifolia A. nana A. nana "petite" Bolbitis heudelotti Blyxa alternifolia Bucephalandra sp "mini Velvet" Bucephalandra sp Ceratopteris thalictroides Cryptocoryne wendtii "mixed" Fissidens fontanis Hydrocotyle tripartida "Japan" Hygrophila...

Hey guys, I need your help. I'm getting a 20 gallon (30" x 12" x 12"). The problem is I am a busy man, and I have to stay out of home 2 weeks a month or more. The plants grow rapidly, especially I have horrible experiences with Java moss, Vallisneria etc. They grow very quickly and if not...