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My shrimp rack is a "central" filtration system combined with individual HMF system. 6 x 10 gallons tank, one is being used as the sump.
A pump from the sump pumps water up to the 5 tanks. I drilled holes in the tanks and installed bulkhead as the overflown return. Each tank is divided into 2 sections by a poret foam HMF. They share the same 45~50 gallons water volume but I have 10 sections to separate shrimps with. Maintenance is easy, I top off the sump every other day with RO water. For water change I just point the pump's outflow to the 5 gallon bucket to drain, and then I refill the water by sucking it out of the bucket with the same pump.
Similar to Boston's system, I can turn off each tank's ball valve and isolate it for soil change or maintenance. Since I have HMF on each tank it can be disconnected from the sump for a while whitout worrying.


A pump from the sump pumps water up to the 5 tanks. I drilled holes in the tanks and installed bulkhead as the overflown return. Each tank is divided into 2 sections by a poret foam HMF. They share the same 45~50 gallons water volume but I have 10 sections to separate shrimps with. Maintenance is easy, I top off the sump every other day with RO water. For water change I just point the pump's outflow to the 5 gallon bucket to drain, and then I refill the water by sucking it out of the bucket with the same pump.
Similar to Boston's system, I can turn off each tank's ball valve and isolate it for soil change or maintenance. Since I have HMF on each tank it can be disconnected from the sump for a while whitout worrying.