i have had my fish tank 3 weeks now and i pout plants in it and also sand washed the sand then left tank 1 weeek to clear petshop siaid best putting 10 neons in and a cat fish so i did with in 1 day 6 neons dide and what is the best way to get my nitrate down as i take samples to pet shop but are all still maximum level nitrate and amonia and i do regular water change but stays same how casn i get rid of these deadly bacterias please help not very good watching fish die 
