I bad u2 u3 they are both rubbish filters i actully have a u2 in my 60 ltr and the u3 in my 180,i am not using plant fert for about the last two month,im very close to returning the clowns to lfs if i c no inprovement,the little guys are too fussy and far too sensitive,will c how the sterazin goes,i also changed my water source which i think has made them a little happier.O and im not blagging my stats,why would i blagg?!!!
People do sometimes..... probably to avoid a ticking off for having an unsuitable tank.
Doesn't make sense with these clowns though. You've medicated quite a lot and as far as we know correctly, your water sounds fine. Have to say though I got stuck using that Tetra de-chlorinater you're using a while ago and didn't trust it too much. Things didn't seem 100% after using that so I went back to the usual one by Waterlife and everything was hunky dory once more.