You could also use the ceramic bricks for a section of the sump they are extremely pourose. Don't take this as any type of expert or first hand recommendation by any means. I watched several videos compairng different types of media for the sump. Many claimed the bio bricks once seeded and well established can house more bacteria than standard rocks. That's what a fair amount of the videos suggested a few others said they were expensive and possibly over rated. I saw some i would have liked to try but to they were to expensive for my budget, so went with cheaper ones. My 65 my plan is to do both. The fuge depends on how my acrylic diy project works.Anybody know if a refugium is a good idea on a frag tank? Or should I use that area for rock since there won’t be any if the display? Or biomedia instead of rock?
This link is to a guy testing various ones out. I’ve seen countless videos on various type. So just one of the more compartive ones I recalled.
Pictured below are the cheap ones I bought from Amazon. I haven't added them to the new tank yet, pending until I attempt sump mod. I've been soaking them for 3 months in my main tank. So I
have no real personal opinion on them until later down the road when i can see their effect good or bad..