IM 25G Lagoon Tank Build

[Synthesis]

Figured i would give an update. Tank is doing really well these days. Still battling with some small patche of bryopsis but its very manageable. My bigger issue is bubble algae and emerald crabs seem to be worthless for this. Any thoughts on curing this??

My flickr account is all screwed up otherwise I would have some new tank shots to show off.
I have added 8 SPS since my last update:
Cali tort
RR Pink Cadillac
Red Planet
Pink Lemonade
Red Diablo
Orange Setosa
Purple Voletta
Green birdsnest

Couple new fish: Royal Gramma, Purple Firefish Goby
Lost a fish: Yellow clown goby


Everything seems to be happy though. I have struggled to maintain my parameters unfortunately. One particular area is Calcium which is baffling me. I use IO Reef Crystals and do a water change about every 2 weeks now. But my Calcium is ALWAYS around 600. My alkalinity I dose daily to maintain 9dkh. Magnesium around 1400. I do not get how my calcium can be this high all the time. My red sea test kit cant even measure it thats how high it is. Never experienced this before. What could cause this?? I can't say I am overly happy with my coral growth either so something seems to be preventing the uptake of Calcium.

Thoughts?