Looks good. But, I wouldnt rule out the possibility of having to go to even smaller nozzles. Basically, to pressurize the loop a bit, the are of all the nozzles will have to add up to less than the area of the feed pipe. You might even get good results going to 3/4" outlets?? Freshwater test will tell you, and as long as you dont cement the nozzles in, which I wouldnt anyways for cleaning purposes, you can adapt down to smaller real easily. I'd fill tank to just below nozzles and try it, if your drain/overflow will allow that. That way you can see the water coming from each pipe easily.
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