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kind of looks like it is upside down. The body should split into two joined by the centre growth bit, and sometimes needs a little help to crack, like a tiny tiny bit of help so you don't split it completely. I use a knife to run it through. You could repot but you could just leave it there in a hydro env. I have a small avo forest and using some hyacinth vases for looks and one has been there for 6+ months now.
After a good start, my avocado seed seems to have stopped growing. There's a new leaf that I can see almost about to sprout, but it's not doing anything. I have changed the water and cleaned the root which was covered in a furry algae type stuff. Should I repot in soil now?