Anoxic Gravel

A reverse flow undergravel filter might do the trick. 2 inches of gravel is a lot in my opinion. To much gravel for dirt to get trapped in and will eventually become anoxic. 1/2 an inch of gravel looks nice also but won't have this problem.
 
If they are unplanted tanks and you just want a gravel layer for look s then I would say yes, just remove as much gravel as possible. A UGF would help but since it requires a tank tear down at this point just going with a thin layer of gravel seems easiest.
 
What's a reverse flow under gravel filter? It won't be too hard to put in an under gravel filter. I only want to put it on 1 side so I'll take the fish out, take all the gravel on 1 side out, put in the UG plate and then just smooth the left over gravel over.

Thanks so much for the input guys, I really appreciate it :)
 
Reverse flow undergravel filter (RUGF) is where instead of pulling water up the UGF tubes with an airstone or a power head, you reverse the flow down the tube with a powerhead that's designed for reverse flow.

Like this one... (It's model 660R)
http://www.drsfostersmith.com/Product/Prod_Display.cfm?pcatid=4628&N=2004+113040

The advantage of RUGF is that you're pushing the fresh water under the plate, and therefore the gravel is oxygenated from the bottom up. So there's far less chance of anoxic pockets and there's also less crud that builds up under the UG plates because the water is prefiltered at the powerhead.
 
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