After I hit post it occurred to me that I was not very specific. My water parameters are all stable, i.e. 0 ammonia, 0 nitrites, 0 nitrates, trace (less than .25 phosphorous), Ca around 400, ph 8.4, alkalinity is normal. Hopefully, we will have our sump/refugium with our protein skimmer up and running in the next little while. It would have been sooner except that we had no idea that essentially nothing will bond to a rubbermaid container. So, we are building it in acrylic. It is a process.