Even though I already thought of that, I sure appreciate you giving me the advice. I figure I will put in about a 1/4 - 1/3 of the bucket full and run a test from 3-5 seconds holding it up.

I hope it works, may even run more than one time to be sure. If no problems I will either fill it up with the 600 or mix the 400 and or the GFC with it and be on my way for a few months. If the fish do ok with it may stick with the 600 if not I will go to 500 if I can find it or just go back to GFC, and or GFC/400 mix.

Thanks for all the help.