Hydors can go up to 310 gph. I have kept them in several systems, including seahorse, softie prop tank, lps tank, sps tank, mixed reef. Kept with several different species of fish. Kind of bulky on a PH IMO. They are able to connect directly to a bulkhead with a plubing attachment IME.
I just like the random flow they provide. Whether or not they could handle all of the flow depends on the size of tank. I have always used in conjuction with some other flow as well.
JME
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