how old are your plants?....are they under a dome?
very first thing that comes to mind is high humididy level and temperature...
two quick fixes for the algae...sprinkle corn meal on the top (the gluten kills the baddies) or H[sub]2[/sub]O[sub]2 [/sub]at a 1 Tbsp/gallon rate...don't use the H[sub]2[/sub]O[sub]2[/sub] unless you have to because it kills both beneficial and non-beneficial bacteria....
... i want to water from the bottom but how much water do i put into the cup? im using the small clear plastic cups.
or H[sub]2[/sub]O[sub]2 [/sub] at a 1 Tbsp/gallon rate...don't use the H[sub]2[/sub]O[sub]2[/sub] unless you have to because it kills both beneficial and non-beneficial bacteria....