T.A. Nitrate Destroyer experiences?/Vodka dosing questions

[Treebeard]

I have been using Nitrate Destroyer for two weeks. Kind of pi$$ed to find out I paid $30 for 946ml of garlic flavored vodka. I guess I will keep up with it for though.

So far I have not seen a noticeable drop in nitrates which are still hanging around 25 ppm. I have reduced my feedings of frozen food to twice per week and I am doing weekly water changes. I am constantly scrubbing hair algae off the rocks and powerheads and blasting the rocks with a turkey baster.

I am thinking of upgrading to a larger skimmer now. I currently have a Euroreef RS80 and thinking of getting a Vertex IN-180. I have about 120 gallons total water volume.