ok question. i mixed 25 gallons up with rodi water last night and this morning there was like a fine powder all over inside the tupperware rubbishcan (cleaned of course before mixed). running a powerhead and airstone while mixing. is that normal? this is the first time i'm going to try salt mix instead of filtered seawater. oh: i don't need anymore problems (as you can see with my alk issues in my other thread, ready to give up the ghost on SPS)