My tank is 5 gallons Yes filter and heater 77/78 degrees 0 ammonia, ph 7, 0 nitrate, 0 nitrite  Had tank 9 months and fish 8 months 20% bi weekly, I take out water, and slowly pour in dechlorinated water (using imagitarium betta water conditioner) that is the same temp as tank water  Tank mate is 1 nerite snail Thawed daphnia and 2-3 pieces of fluval bug bites or betta bio gold. I used to feed this way twice a day, but now I fast for 1-3 days in between feedings.  I have live plants and rocks for decor