
It’s a 16 gallon Fluval, bowed front, with a plastic lighted lid.
Cleaning the new tank I saw it has this.. thing IN the glass on the bottom. Looks like a thread? It is dime-size and doesn’t scrub off, but is slightly raised inside of tank and not outside of tank. Will this weaken the bottom of the tank, or is it ok to hold substrate etc?
Also- will the built in light in the lid be a problem? I would use it sparingly if at all.

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