I have a 55 gal tank I would like to convert to a planted tank if possible. Right now it has koi in it but they are going outside to a pond. The substrate is like 25 lb. white sand and some eco-complete mixed in also a tiny bit of black gravel. I have some more eco-complete I can add when I drain the tank. Right now it has a sponge filter. I could use the sponge connected to a powerhead, or I have a whisper 60 filter or an emperor 400 filter (would prefer to use this) I could use. I am on a budget so I don't want to have to buy a lot of new equipment. Right now the light is a single tube flourescent but I also have a twin tube one and a powercompact Freshwater Aqualight by coralife. I have a brand new heater i can use. Do you think it would be possible to have a low tech planted tank with this equipment and substrate? Thanks so much for any help and suggestions!