I have allergy, and can't tell how the room actually smell. But if I put my hand in the water, and pull it out afterward. My hand smell pretty bad. In my 29G I have: 3 Harlequin Rasbora, 3 Cherry Barb, 2 foxface, 1 oto, 3 ghost shrimp, 3 amano shrimp. Last night, I've changed my water for the first time in a month.
Plants: Red Melon Sword, Water Sprite, Rotala Indica, Sunset Hygro, Pennywort, Moneywort, pearl weed, micro sword, telanthera, wendtii crypt,