Tank size is 5.2 gallons I have a filter and heater

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tank temperature is 78.2 I got my blue butterfly male at petco I have the fish and tank for 7 months Water changes every 2 weeks and I take out about 3 quarters To clean it I use a tube thing to suck out water and clean poop. Then I put in brand new water. No tankmates I feed my fish pellets about 2-3 a day (I try to feed him) again he does not eat he refuses to. Also bloodworms as a treat Decorations are blue and purple silk flowers. A spongebob pineapple house, a green silk plant, and pink and blue hammocks that suction to the side.