I need advice. My 12 year old son is really into Aquariums (Fresh and Salt) and over the course of a year has acquired over 6 of these ranging in size from 29 gallons to 40 (I think that is right). He has 1 salt water and the rest are freshwater. He has coral in his Salt water with 1 fish. The freshwaters he has plants and various fish. The question is: How many are too many? I am very concerned these are all in his bedroom and I worry about lung infections from the moisture and I worry about mold. He is very careful, but the room is very humid and stinks like a lake. This smell has been a little better since he did a filter pad change in all the tanks, but still there. Is it unreasonable to tell him to choose 2 tanks and get rid of the rest? I am so worried about his health. I hate to break his heart as this is his passion, but I just do not know what to do. Any advice is appreciated