if you get a small PH like an Aquaclear 201 you should need a air pump. the surface tension should be enough.
I've never used substrate in a Q-Tank because if you does copper it will remain in the sand. Your Idea of PVC is good.
I have (not to say it's right)
10G Tank
18W NO lighting
small heater
3-4 large PVC pieces 2-3 inches.
2 Large rocks (not LR)
201 PH
AquaClear filter w/ Carbon and sponge
(Carbon is removed if copper or an meds are used)
J
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