Uhmm it's a 28 g jbj with a center overflow and a return on both sides they don't push out an extreme amount of water I have a Duncans chalices frogspawn and a rainbow nem so I wanted to increase flow a Tiny bit. I bought it off a guy on here so I'm not totally sure what the returns are maybe I should just take the.time and.clean out the pumps and it'll push more through
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well, you're dealing with 2 separate issues.
the trigger spitting sand on your coral, i'm afraid increasing flow really won't solve that problem, at least not without causing other problems inadvertently.
the return pump is mostly for water exchange to the sump (not sure if you have one, or using a canister type filter? if so, probably look into alternatives. i had one for my 12g nano, and those things really don't work very well). for circulation, you're better off getting a powerhead.
try to find someone selling a Jaebo WP-25?