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From the look of the tank, the urchin is probally starving. Either that or your parameters aren't stable. He can grow them, back once he has steady food and you got reef parameters.
Do you got any macros in a sump to help balance phospahte/nitrates?
Try to tuck fish scraps/pellets and seaweed...
Could you post a pic of your sump? You should try to have your return pump separate from the refugium. You use a barbbed fitting to connect a hose to pvc and a hose clamp.
https://www.homedepot.com/p/1-in-PVC-Poly-Insert-Male-Barb-x-MPT-Adapter-1436010RMC/203003479
Barbed to Slip/Threaded
You...
Might be easier to start with some fish and inverts. Do you have a fish stocking in mind, since it's best to start with the more passive fish and add the more aggressive fish last. After some time you can add some hardy coral and work up from there. It's good that your planning it out...
I think 3-5x is a better tank turnover rate, and getting the extra flow from the power heads imo. This gives your fug more time to do its job and you don't need such a powerful pump running 24/7.
Is the returns going to be next to the overflow or on the opposite side?
Wouldn't fit in a cabinet, space inside is 38"x 18"x 22ish", which makes a 40 breeder perfect to use instead of building a custom size. Thank you though!
When you say split, do you mean:
-plumbing them in series.
Overflow > sump > sump > Return.
-or parallel.
overflow > sump1 > return
same overflow > sump2 > return
If you plan on splitting the overflow to the sumps parallel, one sump might get filled faster than the other and it...