I am currently running a rena 120x50depthx45width ,complete with sump tank,,as a marine set up(4 years old).I would like to move over to a high tech planted system and have a couple of questions for you experienced guys to answer for me.Firstly could I use my sump tank as a filter system if I took out the planted sandbed system and replaced it with bio balls(the pump in the sump tank has a 3500ltr turnover).Secondly would a overtank luminaire with 2 39w t5 lamps give sufficient lighting.would also appreciate any advice that would assist in the changeover :?