Need some advice... Tank not doing well.

[ALang]

I have had that kind of HA, just not quite that severe.
I am very close to no HA now.
What I did/ used, were: GFO, RO water for top-off and changes, water parameters watched and dosed closely to optimal ranges, about 10 MEXICAN Turbo snails/130 gal (don't get any other kind, they don't work for HA), and a seahare.

Then practice patience. One day you will look at your tank and goes, wow, there is the end in sight! I now have sold all of my Mex snails, except for three. And the tank still looks great.
HTH. Lenny.