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Tinyfish, a few comments to help. You said you use sand on top of the rooting medium to keep gnats out of it. What I do is clean the cuttings with soap before trying to root them, to avoid mold and gnats. I use the perforated cup method with Rockwool and a mix of around 90% perlite and 10% seedling potting mix. I never tested your rooting media mix but if it keeps too much water it's not good. I also use rooting hormone. I use a big clear plastic bin with a cover which I put over a heat mat, the heat helps for rooting. I also use a spray for watering, this way I better control the quantity of water I give the cuttings as over watering can kill them.
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