Originally Posted by p3purr
Wouldn't that be a perfect breeding ground for anaerobic bacteria? Doesn't sound like a good idea to me, there needs to be water movement under UG filters to prevent anaerobic bacteria.
The tank is 150g, set up in 1999, cycled 8 months w/UGF
then the UGF
was slowly (over the course of 6-9 months) turned off. There is between 1" > 4" natural gravel over it w/large boulders on top of some of it. Approx. 60 plants of all types (all doing well). No CO2
(yet). PMDD for ferts, though am going to singles after this runs out. Lighting is low-medium. There are approx 400 large fancy guppys and a dozen RCS. Water changes are 50% every 6 months with all water being syphoned out of the lift tubes using hose and a powerhead. Th gravel has never been vacuumed. There does not need to be water movement if the filter has never been used (I use it mainly as a cushion for the boulders), or has been turned off VERY slowly (over months).
There is absolutely no aenorobic bacteria beneath the bed. I purposely built the stand to be able to always check the filter bed. It is almost as clean as when it was installed 9 yrs ago (10 yrs, this August). Will post some photos soon.