Ammonia reading of 0.25

[robzilla]

ran a batch of tests tonight and the only one out of line was ammonia.
what are the ways to reduce this to 0?
ive got water batching for a water change tomorrow.
will running carbon help?
cranking up the skimmer to get lighter and more skimmate?

& i've cut back feeding. i didnt think i was feeding heavy but will cut back more
any other ideas??

thanks
rob