Hi I'm new to all this fish buissnes and need a little help , I recently purchased a second hand 360l tank I cleaned well put washed new gravel and plants , got 2 x 2213 eheim filters second hand washed all media , filled tank and didn't put any additives in yet , then heated to 77degrees , it's now been 3 days and started to go cloudy ( milky ) have no fish , will this pass on own or shud I add fish or chemical ????? Please, regards Paul , also have air stones x 2