Cleaning out a 10K tank that has not been used for about 3 years now. Tipped it with the trackhoe, and have pumped out the fuel that was left in the bottom of it. It has some goo in the bottom which we are scrapping out, basically trying to clean it out as well as possible. So maybe a possible question. Should one get some algicide and dump it in the tank straight, before pumping a load of new fuel in, or other recommendations???