Well some of my fishies have while spots on their fins so i have done my regular water change then i have cleaned all my filters, removed the carbon and i have dosed with about 17mls of waterlife protozin for a 350l tank. It says to dose on days 1,2,3 and 6 but doesnt state how much to dose with on the additional days. i don't want to overdose my tank by dosing 17mls a day if im only supposed to do small top up doses. can anyone please advise me ?