found a tank +- 340 l got it from angel. pretty sweet setup. gonna set it up next weekend! some serious FUN. few questions: 1) have an 8000l/h pump. would love to use it but im a bit scared it's too much as a return pump. was thinking about making the return pipe a "line" of powerheads at the bottom of the tank all blowing up onto the LR therefore no/few powerheads... make it out of PVC. what u think? oh and the tank has an overflow box in DT with a 50mm hole... 2) got a 9watt uv steralizer. says its good for 200l. should i then leave it on permanently?