11-01-2011, 04:15 PM
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Some people buy a plastic grid -like product in lighting section of a home improvement store. Its called "egg crate" and it is meant to be a diffuser on those four foot fluorescent fixtures. But you can buy it, cut it to the size of your interior tank bottom, and place it there first before adding any substrate or rocks. The theory is that this will help dissipate the weight. I would also recomment adding rocks before substrate, so that the rocks sit directly on the tank bottom. This is important because if a creature digs at the base of a rock that is sitting on top of the substrate, it could collapse the entire structure. Also, there are rocks sold at fish store that are more porous, and therefore lighter weight, than collected rocks. The are usually calcerous, but fine for a hard water set up like this. Also, it is wise for the fish's safety and the integrity of the tank to secure the rocks to each other and the tank wall if you build higher than one "story". A moldable compound is sold for this purpose, perhaps someone with more experience with this product can elaborate. You could also silicone it together, as long as you were cool with the semi-permanence of this option.
As an aside, but sure to be careful about your rock selection (i.e. metallic veins, etc.)
I have no experience with mbuna, but I did once have a cave setup. Good luck, the build is great fun!