Vodka dosing @ 10ml and no change

[aquablizz]

I have a fish only 75 gal display tank and a 40 gal sump... Have never gotten a handle on the nitrates which are always in the 50-60 range. Started vodka dosing 2 1/2 months ago and have built up to 10ML but still do not see any positive results even with 25% water changes each month. Skim is only 1 cup per week.. I have average fish load and feed very light.. Is there a chart that recommend further limits of dosing as the one I use top's out at 10 for 100 gal tank.
Blizz

 

[dragon99]

That's alot of vodka to not be seeing a result. What's your phosphate level?

 

[aquablizz]

Using API test kit barely detectable Phosphates.. never have had a problem with hair algae and fish seem to all be healthy.

blizz

 

[Randy Holmes-Farley]

I'd just keep doing what you are doing for now. :)