I haven't used cactus mix for seed starting, but I use Promix HP (High Porosity) for all my seedlings. I find it very dry, and I'm obsessive, so I water my seedlings every day, top-watering, using a teaspoon or two. It works really well. However, when I pot the seedlings into Promix (for herbs and veggies) I have to get used to the potting mix needing less water!
Linda
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