I had the same problem its probably because your bag of potting compost has
been open and hanging around
I scraped it off and repoted the seedlings in fresh compost


"JimM" wrote in message
...
A couple of weeks ago I transplanted my seedlings into cell trays and put
them into a heated greenhouse. I've noticed though that some of the seed
compost they are in is developing a green surface, I don't know if it's
algae, moss or fungus. Is this something I should be worried about and if
so
what should I do about it.

Thanks

Jim


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