As title- thoughts on best substrate for mangroves-. 1- rock rubble. 2- sand. 3- miracle mud. This would be in the form of a small section of a 40g display macro fuge. Adding a small suspended ‘trough’ (4” front to back, 22” wide, 2-3” deep) near the top, just below water surface to hold substrate so the mangroves are above water. More @Wikipedia
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