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My achilles tang is extremely active and swims around all day. If you have not seen him for a whole day, my guess is that he is dead and under a rock, or very sick and under a rock. Sorry.
Its most likely your ALK. 6.4 is very low. You want to keep it between 8 and 10 for SPS. It only takes a few days of low alk to cause SPS to RTN or STN. Plus if you test kit is not accurate it can be even lower than your reading. What test kit are you using? Lamotte is the most accurate for...
I have been using PE mysis for years. It is far better than any other mysis, the protein level is 3 or 4 times higher than other mysis. I usually get it from PA, and split 10 packs with a few people.
I have a several packs Bill, if u ever want to try it, just LMK.