18 gallon

I currently have a 70 litre (18.5 US Gallon) tank with dimensions of 58 x 30 x 40cm (23" x 11" x 15"). The temperature is kept unheated at around 18 Degrees Celsius (65 Degrees Fahrenheit) with a stocking of 6 Golden White Clouds and 3 Platy (2 female:1 male). According to AqAdvisor, the...