20gal rimless coral/frag tank

[Tyson]

thanks Gillsandfins,
I used flatworm ex and boy o boy did it work, i saw two or three little ones that survived the first dosing so i dosed again; i didn't think of the impact of not doing a water change even though there was like 3 left, i thought because theres only 3 i can't get high toxin die off levels from just 3 worms.
well the next day or two i had a little STN happening, so after i did 5 jumping jacks pulling my hair out i made up 2- 4gal buckets of H2ocean water; seems to have stopped, so far all is good.
The pram's read like this;

Cal 390-400ppm
Mag 1350-1430ppm
Alk 7-8dkh
K+ 390-400ppm
Temp 79.8F
Salinity 1.025