Euphyllia help

[t1a1c1h]

We have a frogspawn and a hammer in our tank. Both are expanded in the day and seemingly 'Happy' but.... once closed up at night its clear that their tissues are severely receding, and there's been no actual growth for months. With the exception of a melting candy cane everything v else in the tank is doing fine, particularly our sps. Is there anything euphyllia are particularly sensitive to or require lots of? They're both in moderate flow, moderate light, plenty of space away from anything stingy. Params are ph 8.2, ca 340, dkh 9.1, nitrates 5-10, phos 0.1. They get fed (although don't seem to actually eat any of the food offered) and there isn't anything that can eat them. We've had frogspawn for 2.5 yrs and it used to be about 3x the size it is now. No brown jelly before someone suggests it! Any thoughts??

 

[Dsekula]

First let me say that this will be subject to opinion.
Assuming that you've been keeping up with normal tank maint (water changes, dosing, etc) and are confident there aren't any trace element deficiencies or over doses considering.
I keep my po4, alk, and no3 a good deal lower than you state (0.02-0.04, 7.5-8, 2-6), with the understanding that these numbers are relative to eachother when finding a perfect balance for your needs I say this. For me I notice recession on my euphyellia when po4 starts creeping around a 0.10 which is where you stated yours is currently. with out getting into anything super drastic I would personally see if dropping it to a 0.08 or so made any impact.
If on the other hand tank maint. Has been a bit lacking and there's the potential for an under or over dose of some trace element I'd suggest doing what ever it is you do to identify and correct it.. wc, icp testing, etc.

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