newbie to it all need some help

Hi guy's,
This is my first grow and i need a bit of info so any help will be appreciated, i went into my local hydro shop and bought an ebb and flow set up, the bloke in the shop sold me a white reservoir now ive heard white reservoir's are crap coz it let's in light there for it grows algae, but ive also heard and seen other people using them, i change my solution yesterday and notice that my tubbing was slimy is this algae?...... Im using a coco and perlite medium, my plant is 2 weeks old from seed and the leaves are drooping is this coz of over watering? how often do i water it using this medium?....... If anyone has more helpful tips it would be welcomed thank you.
 
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