I keep my air on in the apartment 78 degrees when gone and leave the lid OPEN (the small part of the lid) at night. This has solved my problems. If slime or mucous (slime is on top of the water to the point where you can take it out with a net or anything else) then your pump is not strong enough and remember to always have your pump pointing up. Helps with putting O2 into the water. This is the cheap way of solving your problem. I have added an airstone to the back of the compartment (additional cheap pump outside of nano) and it has made a world of difference to the water clarity and to the amount of life I can add to the tank. Temp is stable and we are all happy. OOPS, just read where you have a ten gal and not a ten gal nano, sorry. Long day,reading too fast.