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Yeah... if you're switching from bioballs to LR, I can see ditching the mechanical filtration that went with the bioballs. I'm assuming the original poster removed some stand alone filter unit. Maybe my assumption is wrong.
My point was that skimmers and filters, while both reducing bad stuff in the water, can serve very different purposes. If you're limited on live rock, a filter can house a good portion of your bacterial population in the floss, sponges, etc. Getting rid of that population could cause issues. But if you have plenty of live rock, the beneficial bacteria in your rock is going to be doing most of the work and the bacterial in your filters is kind of just an added bonus. Mechanical filters can still serve a good purpose in a tank with LR by straining debris from the water column. You just have to keep up on maintaining it.
A skimmer on the other hand reduces dissolved organics by pullling them out of the water via foam, versus trapping the debris in a sponge as mechanical filters do.
Me personally, I have a HOT Magnum 250 and a Biowheel 100 with filter pads for switching over to a quarantine tank. The HOT Magnum gets it's sponge around the carbon cannister swapped out with a new one every week.
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