09-21-2011, 12:12 PM
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My suggestion is not to take out the Flourite, but do a full water change. I used it in my 70g and rinsed it fairly well, but the tank was not clear for several weeks. I've no data on this, but too much rinsing might remove some of the nutritive value. Seachem recommend a light rinsing, no more, and they indicate some cloudiness will occur. The "clarifier" they suggest for this I would never use, this can be veryharmful to fish [later]. Let it clear naturally.
Once the tank is aquascaped with the hard decor (wood, rock, etc) and planted, completely drain the water down to the substrate. Do not vacuum the substrate, just siphon out all the water. Then refill the tank, aiming the hose onto a large chunk of wood or rock, or add a bowl-shaped dish and run the water into that; this avoids disturbing the substrate. Add water conditioner at the beginning of the refill. When the tank is filled, start up the filter and heater and there you are. A few fish can go in [assuming you have live plants in this].
I do this with sand too, it is quite good. The water will still have some cloudiness, but it is not detrimental to fish. New tanks clear depending upon the biology and bacteria, so have patience. My 70g with the Flourite took about 9 weeks, maybe even more, can't remember. My sand 115g took 5 weeks, this was bacteria.