what happened

Hi all, I'm looking for some help/ideas/advice please. I have a 180l tank which has been established for about 5 years. I took over the tank 2.5 years ago from my brother as he didn't have time to care for it properly with work, kids etc. Did a partial water change yesterday lunchtime around 30%...

Hi, I recently got two plants from a man selling his tank. He had co2 in his tank but I do not. My leaves have started turning transparent and I dont know what type of plants they are. I dont know what to do with it because its grown rather big and the fish love it. There are dead leaves...