I used to have the fx6, does the 4 also have the outlet at the bottom?I am wanting to get some new plants. I’ll have a look at some frogbit. The plants I have in at the moment are starting to take off well especially my hygrophila corymbosa, that’s doing extremely well.
So after a quick 100L change I’m back at 0 on ammonia. love the fx4 for water changes.