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tricksandthings replied to your postRe: the hollow decoration, I’ve got a sort of…

You can stick a bubbler in it too once you drill holes in the top to keep everything moving and to make it pretty. If not, probably fill it with sand and cover the entire bottom in aquarium safe silicone? Just so there are no holes.

Both very good ideas! The sand is what I was trying to think of but I totally forgot about it 😂