how long have you had those plants for? my java fern initially went dark green but went back to normal after a week or so, just adjusting to your water I'm guessing?
My anubias seems to be thriving, brought as a 3-leaf bunch and now has over 20 big leaves..looking quite cool, thought they were meant to be quite hardy plants?
both my java fern and anubia handles lower pH quite well but the swords don't seem to like it..maybe it's your pH