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Is SA mix #4 too hot to put seedlings directly into it?

Can I plamt sprouted seeds straight into SA #4 or should I use something like jiffy plugs or happy frog? Thanks!

Im starting a grow with Sunshine advanced #4 and have never used it before. I have read some things that people say you should premix lime into it when your potting because it will acidify if you dont. The SA #4 says it has lime in it tho. Also if i do get a pH drop later in the grow how much do...