Wow! I'm surprised you have them cranked up to 80%. That's 1260 gph for each pump (unless the change is logaritmic . . . which it might be). 1260x2/75=33.6 . . . so that's 33.6 times the tank volume per hour. 20 is recommended for SPS. Does that mean that the flow seems quite gentle?
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Shelley
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