Potting soil

Hello everyone, I have a 3 year old Strelizia in our bedroom. It has grown enormously and I wanted to separate it on the one hand (there were 3 of them in one pot) and on the other hand try out whether one of them might survive in hydroponics. It's been about 10 days now and unfortunately it doesn't look so happy. I tried not to give it too much water as the roots are still used to soil. But then I gave it more water because I didn't know whether it had too little water. Do you have any experience or tips? Update, 3 October 2023: My Strelizia has managed the relocation well. I now use monthly fertiliser for hydroponics. It took around 3.5 months until it was happy again. However, I can now give it as much water as I want and still not overwater it. :-) Great for the holidays!