Great build thread. Just a suggestion for those that could not find the Leca balls. I couldn't find them either, so you can use lava rock in place of them. Rinse VERY well. Also, if you are worried about the weight of leca or lava rock, you can create a false bottom by using the egg crate stuff (plastic grid found at lowes or any hardware store, used in drop-type ceilings). Cut it to size and use close-cell styrofoam pieces to support it. I have a couple tanks and have done both. I actually prefer the egg crate, however the leca/lava is a LOT easier to work with.