since i will have some semi-aggressive/aggressive cichlids in my tank and still wanted to at least try getting the BGK since all cichlids will be very small to begin with, i thought i could get several pvc pipes and hide them underneath the horizontal driftwood piece that is going into the tank, and several of these little hidden hiding tunnels throughout the bottom of the wood to give the BGK plenty of room to get away from the other fish if he has to but since the water wont be able to circulate down into these pipes would this create deadzones in there that would be harmful to the knife? let me know what you guys think and if it would be harmful, what kinds of hiding places do you guys have for your knives that could prevent dead spots and still enable them to fully get away from the other fish in the tank