I bought this for my brother's aquarium because he has 3 yo-yo char who like small spaces as it was too open for them. We just buried a log in the gravel and they love hanging out there now. They will max out at 6 inches so this should work even if they are adults. We even stuck a few sprigs of Java Fern into the holes in the "branches" separating the yoyo from the gravel.
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