A castle or something would be fine in a pinch, but yeah its not "realistic" in the sense that they arent often found underwater. I personally dont like them, but I dont think the fish would be scared of it. Plants are a fine choice, there are some very easy to grow ones (anacharis and hornwort come to mind); driftwood and rock structures are nice too.
Do you have a filter for this tank, btw?
Do you have a filter for this tank, btw?
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