im concerned about bioload, the 720l is already up and running, and have bin for a long time.. i gues il just hope they dont have paracites.. went good with my motoros, they came direct aswell...I dont see the problem in giving me a litlebit info about what and how about prazi in 720 tank..seems like everyone has a better opinion, and thats nice, but i just have a 720l available, i also have 220l, but they are much less filtered, so i wont take the risk..