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It's great to see you learning well in this forum. Something to add on about the bio filtration bed system through the use of LR or biological rings, you do have to take note that insufficient flow through the rocks/bio-rings can create bed of detrius which becomes potential storage tanks for nitrates and phosphates. And this method has been proven to hide a neck after a certain number of years (that is if you are going that long in this hobby) So for bro daryl to initiate this method, you got to keep note that his sump has only one life rock such that the flow around the rock is sufficient to prevent detrius build-up. So if you wish to fully utilise the effects of bio filtration ie. going skimmerless, you can do so provided you have the space and means to do it. Naturally that will be ideal since that will provide sufficient bed to grow denitrifying bacteria. but if you can't, best way will be invest in a good skimmer, go slow, KISS method and periodic water changes. Below are some links you can look for reference into biological filtration: http://www.reefcentral.com/forums/showthread.php?t=1838193 (latest TOTM winner in RC) http://www.reefcentral.com/forums/showthread.php?t=1744289&highlight=brazil (personal love for Really DEEP SB technique) http://www.reefcentral.com/forums/showthread.php?t=1885414&highlight=t5 -> look for sanahabit. His husbandry shows how you can utilise a skimmer (not top end) with an algae scrubber and achieve phenomenal results http://www.reefcentral.com/forums/showthread.php?t=1767159&page=51 (one of my personal love for KISS sump and of course, comes with a top end skimmer) Last but not least, http://www.reef2reef.com/forums/pro-corals/49163-sonnys-rimless-shallow-reef-2-0-a-65.html (personal best for KISS technique) Basically, based on what you need, you find a method that suit you best. But do weigh in which gives you more time to enjoy the hobby and less hassle on the long run. We are masters of our tanks; never their slaves. so well, somethings to ponder about.