Have you replaced the test kits? I found as someone else mentioned that there can be a huge difference in readings between test kits. I like the salifert kits but I haven't tried elios. I'd suspect some worm or a crab or even a fish if your water tests out. Clams like higher nitrates, anenome don't (usually) frogspawn should be in the middle, and for what it's worth my frogspawn survived some serious neglect at my hand that killed almost all the sps in my tank so again I'm suspecting some worm, crab or fish. Watch your tank at night, flashlight and some popcorn and keep an eye on the last remaining head. One final thought, do you feed your frogspawn? Try feeding it directly, some mysis shrimp for example, just one or two and see how that goes. Perhaps it's not getting enough food.
Douglas
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