m0useanswered grow question a year ago From what I can tell that brand does not put any micros into to the feeds what so ever. So it might be lacking that depending whats in the medium. their SDS may not tell me everything that's in it... it should but it might not as it does not look standard in anyway to me. check out the label and look for things like magnesium. sulphur, calcium, iron, zinc ext. NPK is macros. the rest are micros.
https://plantmagic.co.uk/safety-data-sheets/
I do not see their organic soil on the web page so can't say much on it. They have one soil supreme listed but the ingredients are not listed and when clicking on its SDS it does not load. So its hard to say what its made out of or needs.
Follow a feed chat by them and go from there. if its burning use a bit less, if its yellowing use a bit more.
Good Luck!