Hi Bud, Thanks for adding me to the L2 waiting list. I like to describe my setup and get a some feedback from you or anyone on his forum as to whether the L2 is sufficient enough for my system. Main tank: 90 gallon tank with a single Lifereef overflow pre-filter box. Sump: 40 gallon long with 4 chambers. Chamber 1:mecahnical filters with polyfil chamber 2 & 3: 10L of Seachem pond Matrix and 3 100ml bags of Seachem Purigen. Chamber 4: Mag 9.5 pump. Also I have 2 pothos plants sticking out of the top of the display tank. StocK: 13 goldfish with a mix of 8 fantails and 5 fancies, all range from 2-8 inch in length (includes tail). Feeding: once in the morning and once at dinner with Total Koi Shogold sinking small pellets. Water change is usually once a week with 80% of the main tank. There has been a few times when I waited 2 weeks. I like to cut down the frequency of water changes. I am hoping just the L2 would be good enough. Thanks.