Hi, thanks for the reply. I noticed it a couple of days ago. It hasn't got any worse and today the redness seems to have died down.
180 Litre tank: 2 Bronze Corys, 3 Black Neon Tetras, 5 Silver Tip Tetras, 3 Glow Light Tetras, 2 Neon Tetras, 4 Male Guppies, 3 Female Guppies, 1 Small Plec, 1...