I used the pfs as mentioned and have not had any algae issues in the 3 months or so it's been in there. I had a sand sifting goby for like 2 days and he was able to sift it easily enough.
I;m not sure if I got silica free pfs though. I have a silicate test that I ran and it came back at 0 so I don;t know for sure.
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.