to open top 30 gallon because I have detritus everywhere, it is a tetra (cardinal, rummynose) and rasbora tank. Has a hairgrass lawn and driftwood so there are plenty places to hide. there is a covering over the intake. ada soil, excel dosing daily, micro/macro regularly although my water has a very high amout of iron in it for some reason, with pressurized co2, high light. looking to add about 20+ and then 15 of another shrimp species, probably yellow shrimp or black bumble bee....any foreseeable problems??