Loaches: no salt, no "ich meds"
What I've found to work wonders:
>50-75% water change with gravel vac (lessens the overall number of the ich protozoan in the water)
>replace with rather warm water
>get an air stone going, if you don't already have one - warmer water has less oxygen carrying capacity
>increase temperature to at least 86deg - anything less, and you're not helping the situation
>a lot of people suggest raising the temp slowly, but often times when it's noticed that loaches have ich, you don't have the time to spare to do it slowly. Increase temp 4-6 deg every 12hrs, until reaching 86deg
>1/2 dose with melafix
day 2, 3, 4:
>50% water change (see reason above)
>1/2 dose melafix
days 5-14:
>50% wc if they are still looking bad
>keep temp at 86deg for at least 2 weeks after last sign of ich is gone