Growth in tank

So in cycling my tank , im on day 23. I added a little seachem flourish to the tank yesterday (which could be irrelevant ) but today i look at the tank and it has a growth that wasnt there yesterday. Now im new to this but not sure if its normal or not. I tried getting the best pictures i could: its on the sand and side of the chair . The chair was added yesterday as well .

Maybe a little better picture will help . Idk what that white ball is either

brown algae or diatoms, nothing to worry about. just leave it be

Thank you