DSB and agronite gravel

tangster

New Member
I have a 75 gallon with 50# of LR and agronite gravel. It has been running for three years now. I want to add a DSB.
1)Can I add the sand on top of the gravel?
2)Do I remove the gravel and add only sand. If so what is the best way to do this. Do I remove all the gravel at once and replace with sand or do I stagger it a little at a time. I am planning on using southdown playsand. Can I put this sand directly in?
Here are my stats:
75 gallon has been running 3 yrs
50# LR
seaclone skimmer
marine penguin bio filter
2 power heads
1 purpe tang
1 hippo tang
1 dragon goby
1 mandarin
1 bicolor goby
Thanks from the confussed.
 
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