just about to start a planted system for the first time having kept a reef system for 5 yrs. do the following seem appropriate 30 x24x20 tank (50 gallons) Luminaire with 2 dennerle tubes tetra plant substrate, depth of an inch covered with a layer of river sand ehiem thermo freshwater filter ( keeping heater out of the tank!) remove any chemical filtration. Any ideas on a good co2 system for a 50 gallon tank? Also has anybody had success growing a tropical minature water lilly within a tank.? i remember an article in PFK a few years back. Seemed to suggest potting it up in a pond lilly basket. want the tank to be open , how high should the pendant be positioned over the water? would not want to burn leaves or possible flowers!