Would agree here, i have a silica bed that has been running for 4yrs and have about 62 fish in the system now with my nitrates sitting at about 3ppmIMO as long as the grain size is correct you can use whatever you want (silica, crushed coral, aragonite, sea sand)
I think the claims made for aragonite (in terms of buffering) are over-rated, but if you think it looks good go for it. I would use aragonite in main display for appearance purposes only, but would not waste my money using it as a DSB substrate.
The general measure is sugar grain size, as for the sea sand i can't answer as i have never used it but have heard of folk that have and not had any hassels.What is the correct grain size for a DSB?
How do you measure it practically?
Is the fine white sand you get on beaches suitable?
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