My me (a newbie) to answer this.
Phosphate is like nitrate. Will not harm fishes but will harm corals or inverts. No problem for high nitrate or phosphate in a FOWLR
but they will cause algae issues. I think PWC
will be the best way to rid these 2.
has got nothing to do with specific gravity. SG
shows amount of salt in the water, how salty the water is where as ALK
shows how HARD the water is I think. ALK
has got something to do with Carborate Hardness and these 2 have direct effect to pH. They will cause pH to fluctuates IMO
Did I say that right, anyone? Sorry still new only have 13 months experience keeping a nano FULL with corals.