i bought a jewl rekord 600 (60 litrte) 4 months ago set it up as instructed and everything was fine.
i wanted a bigger tank so i baught a fluval roma 125 (120 litre) and was told if i transfer all my water from my old tank and fill it up with treated tap water it would be fine to put my fish straight in so i did exactly that everthing was fine and today when i turned the tank light on 1 guppy 1 moontailed molly 1 siamese algue eater 2 tetras and 4 barbs were dead and all the other fish are hovering at the top of the tank.... can anybody help me please thanks Sammy