The triton ones are now processed in CA and the results come back quickly. https://www.bulkreefsupply.com/icp-oes-testing-kit-triton.html Also seems to have good reviews.The frag system was 160 gallons. I am running carbon. Try every other week for water changes but at least every month. Next time I go to Neptune's I'll pick up an icp test
I'm not sure what the various LFS carry, but I've been happy with this one.