I've stopped using jiffy 7's because the fine mesh around them is constrictive to roots even though it is claimed not to be! They also get covered in algae with being permanently wet!
I could I suppose, take off the mesh when planting and put up with the algae, but I would rather just grow in small re-usable pots and use a more 'open' compost.
Personal preference I suppose!

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My Majesty made for him a garden anew in order
to present to him vegetables and all beautiful flowers.- Offerings of Thutmose III to Amon-Ra (1500 BCE)