Quite a few different commercial ones including Pro-Mix and Miracle-Gro, etc. I'm not inclined to build custom mixes using 4 or 5 different ingredients. Basically all are Peat mixes + Perlite. The mushiness is not apparent near the surface -- it's down close to the grate especially when there are lots of roots in there. And the boxes are level. My tomatoes do well as-is, but I'm just not happy with the degree of wetness.
-GG
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