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When we ran our 30g cube (I think it is the same dimension, old oceanic cub that is not built anymore with real think glass) we tried koralia's but they were way too big. If you can find a used mp10 that is what worked best for us.
Spawning inverts is a good sign. They almost crashed our 30g doing that at one point as about 6-8 of them were releasing that substance and essentially milked the entire tank. We had to do an emergency water change.
Very nice pavona.
I think it was an alk spike from your dosing pumps. When my pumps were not calibrated in I would get some RTN from the Alk spiking up. If you did a %30 water change and your alk was still at 9.2 it could have been much higher which is why I think it was the alk. Also the...
Method described above it good. We also look for snails and hermits that have in on their shell. Your calcium levels are good, what sort of lighting do you have?
I just got my Mazzarra P units in, have not set them up yet. If you want to come check them out, I will see if I can get to them this weekend and get them hanging.
So which holidays are we talking about here?