I need some help, ever since a water change 3 weeks back, I have these white specks of dust (?) in my tank. It doesn't seem to disturb my livestock but it just annoys the hell out of me because it gives me this thought of it being 'dirty'. This has never happened to me before so I'm not too sure what's going on.
Tank: 4 months old, 4ft DT with 3ft Sump, total volume 140G.
Parameters: Quite stable, 0 NO3 and 0.5 PO4 (slight elevation since 2 months back will get this sorted soon)
Fish: 2 Anthias, 2 Snowflake Clownfish, 1 Blue Hippo Tang, 1 Copperband Butterfly, 1 Long-Nose Hawkfish, 1 BiColour Blenny, 1 Dr Shrimp.
Corals: 1 S-size Hammerhead, 1 M-size Torch, 1 L-size Anemone, 1 S-size purple seafan, 1 M-size rainbow chalice, 1 S-size Scoly, 1 Demon Whip frag.
Sump: Refugium with chaeto, lights and bacteria houses. Bubble Magus Curve A8 skimmer. Bag of Redsea Carbon in 200micron Filter Sock. Reusing a 5watt UV filter.
Light: 2 IntLED R60