Hey just one little thing I thought I would mention- I dont think tap water causes big algae outbreaks, I know many people use it and so have I since I started about a year ago. Was the algae you saw brown- then it might be diatoms which are a sign the cycle is happening. My tank sand was clean for 2 weeks when I started then it started turning brown- then I had a layer of brown all over my sand and rocks. Turning my lights off for a couple of days helped get rid of a lot of it. But it will go away with time.
If your stuff was algae then I dont know why but I would guess its more of a cycling issue( it takes a while for a tank to cycle).
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