Tell us about yourself!
For the algae, anything light blocking will work - build a ply "cupboard" around the underworks or you can get specific light shielding material for hydro (pandafilm is one I know of).The bigger reservoir you previously had would be perfect for DWC of tomatoes!
How do you calculate the total size of the shade relative to the area you want shaded? I've seen estimates up to 10cm undersizing to allow for stretch
oh man. Get yourself a trio. so much easier
Never thought of using coffee as a dessicant! Does the coffee leech any flavouring into or out of the fruit?