Actually, the pebbles pose no impaction risk under the water. They don't feed in there, so no risk. The moss however, is not aquatic and is going to pollute the water. If you want moss in the water, go with an aquatic version, such as java moss.

I would also give them a sense of privacy and comfort by wrapping three sides of the tank with something dark. Construction paper, shelf paper, ect. It's not necessary, but they would appreciate it.

Some hiding spots out of the water would also be good so they can have a bit of extra privacy.


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