Gluing two different plastics together is hit or miss and I have no idea if gorilla glue will bond to both acrylic (plexi) and ABS. I would take a scrap piece of acrylic and try to glue it to the back of one of the cages in a hidden area. I tried gluing PVC with gorilla glue and the bond was poor, if I remember correctly.



Silicone, if that's that you mean by aquarium sealer, bonds very poorly to acrylic and is probably not the best choice.



A few more ideas for gap-filling (and flexible) adhesives:



Lexel, which is a clear caulk. This is sort of like a solvent based silicone, and very strong and sticky. It is not rated suitable for aquaria or animal enclosures, but it rated suitable for outdoor fish ponds. Certainly if you use this you'll need to let if offgas completely. Neodesha cages tend to be well ventilated so I think it would be okay, but you have to make that decision yourself.



Vulkem or other polyurethane based caulks. Again you'll need to let this stuff offgas. Has been used in both aquaria and animal enclosures, although I'm not sure if it's officially rated for such use.



Thickened epoxy. No experience with this myself, but have heard of it being used in similar applications.



Some of the various IPS Weld On caulk-like adhesives. I believe these are two part and come in a gun which mixes during application. Have heard very good things about them for bonding plastics. Last time I checked their website was very difficult to navigate so it may take some time to see if they make an appropriate product. These have been used in reptile cages.
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Currently keeping a small collection of various Gonyosoma. Both G. janseni and G. oxycephala.

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