You definately want to drip acclimate in the future. The bag floating idea is a bit old. Coming from the lfs
it might not be so bad, but for shipped livestock where the water might be in the 60's or low 70's floating causes the temp to rise too fast.
The biggest reason for drip acclimating is to allow the water parameters to equalize slowly before releasing livestock into the tank.
Next point and it's a big one. QUARANTINE EVERTHING before adding to your tank. OK, snails inverts and corals don't need to qt'd, there are shorter methods for insuring they are not carrying parasites or disease into the display tank.
Please visit the articles area and read. Then post your questions as they arise.
BTW, your clowns will probably be fine (hardy fish). Just give them some time to acclimate to the new environment.