I have some models what are “killed in action”, or ready for the bin.
Now I have an aquarium and I was wondering if I could place such a modell between the fish, and what do I need to do to not kill my fish with the lack/paint/glue on the model.
Given that my wife runs a pet store and we are avid aquarium fish folks I can tell you that no, that is not a good idea. It’s pretty simple, if it is not specifically made to go in an aquarium, don’t put it in.
You could build a box of lexan , Put your model in it and then put that in the aquarium .I have seen that done . It does NOT allow any part of the model or it’s finishes to interact with the water where the fish are .
I have done this with shipwrecks ad infinitum and it does work .I don’t know what the aquarium guys on the T.V. use but they do it all the time . Tanker-builder
I’ve never done it but I had a friend that did - He built an old Lindberg sailing ship, did some minor detailing (hole in lower side, broken ratlines etc) painted it with enamels (IIRC, he let the paint dry for most of a week) and installed it in the rear corner of his 150 gallon tank (even carved a little hardhat diver complete with airline generating bubbles inspecting the hole). It was in the tank for several years and it didn’t seem to cause any problems to any of the fish or plants in the tank.
I once built a viking warship specificaly for my fish tank I used tank safe glue and did everything right…except the gold paint turned green and then so did the fish!