You could look on James' thread "new to the forum". He has a 160L tank and soft water like you. They were making lots of suggestions in the last few weeks. Yours being a 125L is close, but take into account your set up is 20% smaller.Yer I think I will go to 15 but I definitely want something else in there aswell
They seem to be ok I don’t really know how they should look etc as I literally don’t have a clue about them