Critter cages have weaker silicone seals and are advertised not to be holding water. Probably OK for some thing like a turtle tank where they’re half full, but I would not fill with water And trust the seams.
Very true about the bead of silicone. But if you place a new bead of silicone it will be good to go. I have been using a critter cage for over a year now as first a frag tank and now it's a nem/clown tank. I'll post pics tomorrow