if you dont see an improvement with the warmer water and salt theres a good chance you have SUPER ICH which does not get better with warm water and salt because it has mutated... for that you need meds... ridich+ works..
the dats are not nearly as sensitive as the clown loaches so you may want to seperate them IF it comes to that.. ive been treating my clowns for super ich for over a month now (it took about 3 weeks for me to realize that it was not getting any better just staying worse... keep in mind ich looks worse before it gets better)..
follow the dosing directions on the bottle.. when i first started dosing my tank i added 5ml every 20 minutes till i had a full dose (120 gallons worth) i have not lost a loach yet to ich... however ive lost several (15 or so) to treatment...