I was thinking and I think you should should somehow make a sandy beach area with a mangrove growing out of the sand and a little guy fishing off his boat at the end of the stairs.
I'm thinking the sandy beach area can be irigated by the same stream coming from the top of the rocks. As long as a grainier sans is used, you can use some sort of a strainer type material so it trickles down in the tank. A mini cool looking refugium as it will have at least a mangrove.
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