what adhesive is used to fund the aquarium inside the tank?

If it is a plastic bottom that is just a plastic sheet with an image printed on it, that the tape to the back of the tank outside. If this is some kind of background inside I've never heard of, then I would say silicone for use in aquariums paste inside a tank dry. I would not if the tank is already full …

How to make a goodlooking background for your enclosure

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