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[hereje]

Got some san pedros i germinated last month in a beaker - they are currently ~1cm tall, still n the beaker wih lid once a week i let some CO2 in the beaker and they were doing well untill about a week and a half ago when a couple were beginning to take on a dirty green color and last night i noticed that alge is starting to grow on the soil

Would like any advice i can get before the problem becomes serious

[New Wisdom]

I've never had algae harm the seedlings. I get it in just about every seedling pot after afew months and it has never taken over a seedling. Except once and the seedling was tiny as hell. It was like the size of a grain of sand (aztekium riterii seedling) but with trichs it has never harmed them. 

Does the plant look shriveled up?

[hereje]

Ok good to know thag thealge isnt harmful i was a bit concerned on that -  Not shriveled at all nice and plump - but they are starting to develop a sligtly dingy green color to them aswell  its dificult to see in the photo but look at the center top seedlings thats a good example - also when would be a safe time to pull them out of the beakers controlled atmosphere and pot them into individual pots soil in the beaker is 1.5-2cm deep

[New Wisdom]

They look great to me. That color just comes from light. It will darken them. There's no health problems associated with it in my experience.  Just keep an eye on them and make sure the algae just doesn't spread onto the seedling (which is rare)

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[hereje]

Cool tyvm i appreciate the advice a lot