I am looking to add a 20g frag tank to my tank i don't know if i should attach the flow lines into the overflow line going into new frag tank and then down into the sump. or if i should just make it its own small system, if i do it this way what will i need as the filtration system can i use just an overflow water fall filter and a power head to keep the water moving. Also what type of lighting would be best i was just thinking about a t-5 system with 6500 bulb or 10k cuz i really dont want a MH fixture on a 20g tank.