I'm going to have two shark tanks, one that is an 18'x52" circular pond and another that is 25'x15'x8'. Please describe THE BEST filtration for these tanks which will eventually have a couple hundred pounds of fish. I want a thorough rundown of EVERYTHNIG needed for INSANE filtration. I want to have so much filtration that all I need to do is have an automatic top off system and practically no water changes. (I've already chosen my mad filtration but I would like to hear what others have to say) 