Yeah, I wish I could attach them to the bottom like that but I have no idea how I'd attach corals to them, I would like to take them out and glue stuff to them over time...
I was just outside a minute ago, and I was able to figure that the bigger one needs between 5 and 6 lbs of something to hold it down, and the little one needs between 2 and 3 lbs of stuff to hold it down.
Someone had mentioned attaching glass bases onto them to weigh them down, I think I might be able to do that with enough plates fo glass. I have a ring saw and grinder so I'm able to cut the glass to fit, shouldn't be a problem.
Does anyone have any ideas on how to get them negatively bouyant, other than piling dense rocks, like granite, on the bases? (personally I just don't think it'll look good) Or how I could use the glass to hold them down? I was thinking drilling a couple holes through the glass, and attaching them to the structures through the eggcrate with nylon bolts.
Maybe, if I saved up a bit, I could buy some really dense tonga branch, and attach the rocks with zip ties to the bases. Just though of this and I might try it, if I can afford it
. I think this, if the glass didn't work, would be the besst looking solution.