This is one of the largest myths I've ever had the pleasure of vehemently disagreeing with. I've got 16 50 gallon tanks at the shop composing the coral side all tied together with a common sump. Roughly 1000 gallons total volume. They are plumbed so that there is no way anything can move from tank to tank without traveling through at least one of the two Little Giant 4MDQ's providing circulation.
Each tank is TEEMING with amphipods, copepods, isopods, stomatella snails, limpets, mysis (larvae, juvenile and adult) shrimp and some unidentified species of other snails.
The mysis shrimp started breeding in one tank and moved throughout the system. I've seen 1/4" long amphipods and similarly sized isopods living happily in protein skimmers, which means a trip through TWO pumps, once through the Little Giant to the header tank and then through a RIO 3100 into my downdraft skimmer.
Some tanks have lower populations of zooplankton(usually the only kind that can be seen with the naked eye) than others? WHY? FISH! Fish are the number one killers of plankton, they are feeding. I've got a very fat and happy Sunrise Dottyback to prove it. It's the fish not the pumps people.
My captive propagation system has an even higher concentration of zooplankton. This system is 3 30 gallon tanks and 2 40 gallon tanks. Fed by RIO 2500's from a common sump this system only has LR in ONE of the 5 tanks on the system. Approximately 10 pounds....(no NH4, NO2 or NO3) 40 gallon tanks don't have lights yet and are empty, 2 30 gallon tanks have lights and contain mushrooms, xenia, capnella, GSP, etc. All that said, the two 40 gallons are totally empty but very large mounds of sand have been displaced by worms, and they are full of tunicates, sponge, and zooplankton. No live sand was used in ANY of the above mentioned systems, and in the case of the coral growout system, only an EXTREMELY small amount of LR in ONE of the 5 tanks as allowed for a heavy population of life. The key again is NO fish are in this system.
Pumps don't kill, predators do. IF you want this life in your tank add a refugium or cut down on the amount of fish.
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