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I'm trying coir for the first time this year, too. I used a 50/50 blend of coir (originally saturated with an organic seed starting fertilizer) and perlite in a seed starting flat with a terrarium style cover. I noticed that green stuff is invading the top of the flat. It doesn't look like moss, and I'm afraid whatever it is (fungus?) is going to hurt my seedlings as they come up. Any suggestions about WHAT the green stuff is and what to do about it? Will applications of neem oil help?
If the top of your potting mix (whatever it's made up of) is too moist, you can get a green algae growing on the surface. It's pretty harmless, although a thick mat of it might smother tiny seedlings. More to the point, if you're seeing the algae, it means your mix is probably too moist, and that invites problems such as damping off. Take the cover off for a few hours until the surface dries out a bit, then water from the bottom only once the seeds germinate.
I don't know if neem will help, but hydrogen peroxide water might be a good spritz (1 tablespoon of 3% hydrogen peroxide per quart)... but I wouldn't saturate the surface with anything else for now.
If the algae is growing thickly, you may also be able to physically remove some of it from the surface.
