Temp wont kill Ich, just speed up their lifecycle, which is a good thing!, to accelerate the treatment process as salt OR malachite green can only target the free-swimming stages (we cannot see this stage generally, we see the cycts on the fish as "salt grains").
Anyways, the LFS is correct, using 2 different treatments is redundant and only more stressful to the fish. Personally I would go with Salt, but the Meds will work just as well. If a new tank, test you water frequently as the medication can kill-off some of your bacterias, especially in a new tank this can have a 'hickup' effect w/ small spikes in Ammonia/nitrItes.
After the Ich is visibly gone, I'm not sure what the Malachite Green says, but generally you want to treat for 5-7 days after to ensure a total kill-off.
Anyways, the LFS is correct, using 2 different treatments is redundant and only more stressful to the fish. Personally I would go with Salt, but the Meds will work just as well. If a new tank, test you water frequently as the medication can kill-off some of your bacterias, especially in a new tank this can have a 'hickup' effect w/ small spikes in Ammonia/nitrItes.
After the Ich is visibly gone, I'm not sure what the Malachite Green says, but generally you want to treat for 5-7 days after to ensure a total kill-off.