Help

[Aod626]

Yesterday I fully cleaned my 20 gallon long aquarium and scrubbed with scrubber that I bought at Petco well I cleaned the whole tank water was Soo clear but when I got home. This happened should I take out the glow in dark gravel that I bought on eBay I'm Soo mad I litterally carried the 20 gallon tank down my stairs to clean it outside with the water hose to get a big FAIL I do have Indian almond leaves about 2 big leaves and some floating plants. I did use water conditioner but I didn't age my water any advise would help I do have. Male betta and female betta in the tank but separated is this algea or some type of fungus ?? I also used aquarium salt.... before(yesterday) and after pictures

 

[King Fisher]

So that much accumulated in one day....pic #3? Maybe I'm not sure what I'm looking at