ID This/:)

[nitrogenbubbles]

Looks like my brain has self digested itself/:) It is over 2 years old...tank peri as follows:
(all Measured with IO test kit)
pH: 8.3
AM: Nil
No2/NO3 Nil
Ca2: 475
ALk: 4.2mEq/L

75L trapaz overflow
25G sump (ap=375GPH flow)
2x 900MJ
Remora Pro
2x 175W 15KK SEMH
108W 460nm T5
CA2 Reactor (Mod Coralife) korilian media
Scripps change 10G/w
H20 life cyclop and brine/spirnila 1block each/day
lightly stocked livestock