My Tank is cursed...need help!!

[Amadod2]

for P04 i used both a hanna checker and salifert, for cal and alk i also used salifert and for the other i used API

[Amadod2]

my RO unit was serviced not to long ago, i believe back in December, i also have a TDS meter on it, it reads 0 for the RODI water coming out

[Amadod2]

any other thoughts??? things are still dying off and i have no clue as to why??

[Craigdillman]

Not sure why yet,

But do a few big water changes and try running some carbon for a little bit even if its in the filter socks maybe a contaminate got into the tank

WC and carbon are a good start for most problems then keep diagnosing it

Fish all look ok?