<span class="link_user">@CRiSPrGrow</span>,thank you very much. I will upload a picture of the roots next week. I will clean the tank with: FlashClean and will add Easy Roots.. Do you think this is oke?
https://www.growland.nl/GHE-FlashClean-1L-FloraKleen?curr=EUR&gclid=Cj0KCQjw5oiMBhDtARIsAJi0qk0fzxdP8ewDLolgitlw2FDksea-t6uwh-gtJgFHG8wzRnWM5Pd_8EUaAmcEEALw_wcB
https://www.royalqueenseeds.nl/growing/452-easy-roots-mycorrhiza-mix.html