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didn't think about if op was trying to create a dsb on purpose. crushed coral would still be wrong for that use.You are creating a DSB and you need to be aware of how they work and how to properly maintain them. They are an advanced system and you can be easily be fooled into thinking that they are just sand.
under gravel filters are pretty much out of favour now, some old timers may still be using them, but probably as reversed flow ugf. water pushing up from underneath the sand. but 4 inches is still to deep.What if I were to use under-gravel filters?
I guess I should prolly say what I'm trying to do
I plan on getting some wrasses, but also want some sessile bottom cridders like rock flowers
My plan was to make a border wall out of rock fragments and have a softer sandbed with a crushed coral bed on either side
You could maybe get away with glass or acrylic partitions, raised a little bit above the depth of the beds, which I am sure would help, but over the years and decades aquariums run for, I'm also quite sure it would eventually get mixed up.Well I was going to put bits of live rock between, but I guess it could still pass over that