Okay, so FINALLY pulled the trigger and bought a 270 fiberglass tank with windows from pentair ($850 shipped), a laguna max flo 2400, and will be using an old 75 gallon as a sump. Stock: arowana, 2x BD stingrays, 1x VATF, 1x pbass, and 3-6x dats. My question is this is my first ever sump, I don't want to do bio balls/sponges due to not wanting to make a tower. Would K1 or ceramic rings be the better option in terms of initial cost and maintenance cost? I'm just thinking dump a ton of ceramic rings in there and call it a day. If so best seller on ebay to buy good ceramic rings from?