So it's not just me. That's good to hear.I've personally never had long term luck with those plates. Like you, they seem to do great for 18-24 months. After that they slowly die off. I really like them but stopped buying them about a year ago. Wish I had a better answer for you. All my SPS/LPS would be doing great. The plates would decide it's time to go.
So it's not just me. That's good to hear.
Idea for a new thread. Things that just don't last in our tanks?
Funny you mention that - I've been thinking for a long time about starting a thread about critter longevity, from the good (14 year clownfish) to the bad (2 months for Crinoid). It could be a useful reference if we got enough people to chime in.