Try rockwool instead of clay, smaller net pots, as the roots are in h2o, the pots are support, as well as add trellis to help with weight distribution. Mild peroxide solution can be used to sterilize immediately followed up with a triple rinse. But don't let it contact the plant at all if possible as peroxide will strip the protective waxy coating on the leaves and stems making it easier for pests and moulds to attack, same goes for the unprotected root hairs.. careful if you do.
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