my new 8" blacks tail and lower fin got bretty bad heater burns, but none on the body. i set my heater horizontal about an 1" under the waters surface and i think he rested on it or brushed against it. needless to say i relocated the heater to a vertical position and placed it lower in the tank. i also added 1tbs. of salt per 5g of water, and made shure perams are perfect 0,0,10. anything else i should do, or have i covered all my bases?