Hi All, First timer I need some advice guys! I have a new setup (about 6 weeks old) and in the first 2 weeks everything was fine. The problem started when I went for holiday for 3 weeks and flatmates forgot to add the TPN!! Now I know who my mates are! When I came home I saw that the beautiful bright green colour changed to dark green and plants look like they were rotting. Started adding TPN 8ml every 2nd day about 10 days ago but canâ€™t really see any change jet. New â€œleafsâ€ on the hair grass are yellowish and curly and once they reach 3-4 cm in height they become brownish. Tank is a Juwel 180 actual volume roughly 130-140L Pump 1000L/h Iâ€™m using DIY CO2 bottles, changing 1 each week, giving me 0.8-1.4bps Rhynox 2000 diffuser Juwel T5 light 1x Day(front) 1x Colour(back) (2x45W) Plants: 5x pots of hair grass and 2xpots of Cryptocoryne wendtii Tropica substrate 5-6 L Water change 40L/week TPN 9ml every 2nd day I have 25 cardinals, 7 amano shrimps, 2 zebra snails, 1 suckerfish, 3 Saeâ€™s. I was gonna get a lot more plants but just before I purchased them the light bar broke and within a week the pump too!! I had to spend like Â£140 on it so couldnâ€™t afford more. Iâ€™m a student and donâ€™t work at the moment. Iâ€™ve done some test and the results are: PH 6.8-7.2 KH 6-8 GH 10-20 NO2 0 NO3 20-40 Donâ€™t know anything about my tap water (K,Mg,S,B,Cu,Fe,Mn,Mo,Zn) I live in North London (N22) if anyone has any idea? My question is what am I doing wrong? Or I just need more time? PS: Iâ€™m getting a pressurized CO2 system hopefully within 2 weeks. Will that solve my problems?