Today at about 11:00 am I added 3 clown loach to my several month old 30 gallon community tank. The Aqua Clear 50 filter has always been set on medium flow and I also have a small aerator. I have some tetras, a couple of mollys, a rainbow, a few neons. I do a monthly 20% water change and change the components of the filter on alternating basis. This afternoon at 4:30, I notice one of the loaches with a cottony white spot. I acclimated them tempwise by allowing the bag to rest in the tank for about 20 minutes. They seemed fine inititally. Could ick symptoms manifest that quickly? Do I need to remove them? The fish store I bought them at has never sold me sick fish before.