I am in the process of setting up a frag tank with sump but have limited space for live rock. What are some options for me to increase the biological filtration for this system?
What I would do, is put a layer of seachem matrix on the bottom and cover with a good layer of sand. A lot of the seachem matrix will float that's why it needs to be covered. I actually set up my deep sand bed refugium this way and have never had a problem with nitrates. The matrix is extremely porous and will host a ton of bacteria.
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