Its about 5 months old now.I have 4 peppered cory, 2 pearl gourami, 1 dwarf gourami,2 platy. I am running a fluval 205 ext filter and it is well planted,but my ammonia is still at 0.25m/l no matter what i do. I change 10% water weekly, vacuum gravel every 4 weeks, rinse filter media in old tank water every 4 weeks and replace carbon in between cleaning every 4 weeks.I am currently feeding a small pinch or flakes once a day and a quater of an algae wafer for my catfish.What is going on plz help!!