plus they will float if you seal them properly.yes you could but why?
I just want to make sure the fish are safeLego is safe, quite a few members have made Lego themed tanks, but couldn't say on the 'action figures'.
As long as they are plastic, have no glues/paints/stickers, no excessively sharp bits and no bits that could come off and be swallowed they should be fine.
As for sealing with silicone, yes you could but why?
Tizer how rude!!! Everybody decorates their tanks differently!
I want to see ken and barbie in somebody's tank really badly now