I have two set ups - one with Cobalts and one with Black and Greens (pair in each). The Green and Blacks are smaller and less active, but are in the bigger tank 18x18x24 vs 12x12x18. I think I need to exchange the habitats. What do I need to do to the habitats before I do this? Does everything need to be sanitized? Both pairs are healthy. Thanks for any advice you can provide.


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