hey guys i treated my tank two days ago with ultralife red slime remover and it is needed to be retreated there is alittle more left and i was wondering do i need to do a water change first and then retreat or just retreat and i also have alkalin8.3-p to help kill my dynoflagic algae i was just wondering if i can use them at the same time or no or really how to go about usingthem to kill theese algae