Well you started off saying that you have a mature tank of 8 months, that in my opinion is not a mature tank. You are dosing and that also is unusual for a young tank. Whenever you dosing something and it is not needed then you throw something else off. I think that it is your water chemistry. My current 125 has been up for 5 years, and I never do anything but WC
. I have 6 nems and the oldest is about 8 years old. As far as lighting my nems sit 4 inches under 2x250 MH
lighting. So I have some doubts about your lighting. He isnt starving to death because he was under a rock for a week, I never feed mine. I would stop dosing and stick with water changes, I have never had any issues with nems and I just give good lighting. WC
and stable conditions. I actually sucked one off a rock accidentally 6 months ago while cleaning the sand, put him back into a hole where he would stay and it had no effect what so ever.