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These RFUG's work quite well.
They never really caught on that much but many Floruite, EC, FB and other substrate came out about the time I was suggesting them.

I gave up on this after seeing that the lfourite wasd doing a better job and did not have to add anything like piping, tunes going down there, powerheads etc.Flourite was simpler and more effective.

If you use plain sand I'd suggest doing these though and dosing the water column.

Tom Barr
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