Any advice appreciated

[martinmcnally]

I have had my tank for about a year and a half now. I think I have met a few of you guys in Red Deer. I feel like I am banging my head against the wall these days. Stuff is not dieing which is good haha but its also growing very very slowly. I am also having some issues lately with polips not being extended on some zoas and xenia. Wondering if anyone in Red Deer would want to come by and take a look and perhaps give me a few pointers as to how to get the tank to the next level.

I discovered my calcium was low just yesterday around 340 for the first time in a long time, I added a few clams I guess they are sucking it all up. So currently trying to raise that. Other tank parameters are:

Salinity: .0025
Alk: Normal
Temp: 26oC
Nitrates / Nitrites / Ammonia etc all zero
Phosphate: 0.5 - been struggling with this one but I think its under control now its falling every day with water changes and Rowaphos.
Mg: Not sure. I ordered a test kit, I think its going to be low if the Calcium is anything to go by
Calcium: 340

Also been struggling with red slime i hope due to the phosphate level so hopefully that will end with the phosphate nearing zero.

Attaching a pic of what it looked like a few weeks ago.