placing more discus together would definetely make your discus less stress. i think your fish hide behind the dw because it's alone. try adding more discus. acutally 4 x 2 inches discus inside your 2ft is good but when they grow up you will have to find bigger homes for them. for the temperature part you can actually still keep in low. the discus will adapt to the temperature after it settles down. i'm not a discus expert. just my 2 cents worth. hopes this help.
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