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- Newsgroups: rec.aquaria
- Path: sparky!uunet!cis.ohio-state.edu!zaphod.mps.ohio-state.edu!uwm.edu!ux1.cso.uiuc.edu!news.cso.uiuc.edu!s.psych.uiuc.edu!ffujita
- From: ffujita@s.psych.uiuc.edu (Frank Fujita)
- Subject: RFUGF -- too much?
- Message-ID: <Bxspz7.A3E@news.cso.uiuc.edu>
- Sender: usenet@news.cso.uiuc.edu (Net Noise owner)
- Organization: University of Illinois at Urbana
- Distribution: rec
- Date: Mon, 16 Nov 1992 06:28:18 GMT
- Lines: 24
-
- I have a 29 gal aquarium. In it I have a Aquaclear 802 powerhead
- powering a RFUGF. I've sloped the gravel (Black Beauty -- much bigger
- than sand, much littler than 'normal' colored gravel -- a 'natural'
- black substrate) so that most of the gravel is right above the lift
- tube, with a moving out to almost none (just enough to cover the plate)
- at the far end of the tank. I use a few pieces of red slate to help the
- gravel rise at a steeper slope in a few places.
-
- What I'm noticing is that at my lift tube corner (where the gravel is
- about seven inches deep), the gravel is sifting/shifting/moving. That
- is (I'm guessing but this is what it looks like) the gravel near the
- bottom of the corner rises with the water pressure, and then falls back
- to the plate as new gravel at the plate rises to the top.
-
- Is this good/bad/irrelavent? The biological filtration would seem to
- have no problem adapting to this situation -- however, I'm afraid that
- one of my fish might fall into the 'quicksand', and be injured/killed.
-
- I've put the flow control knob at the 'low' setting, and this doesn't
- seem to stop the situation, though it reduces the speed of the activity.
-
- Comments?
-
- Frank Fujita
-