stocking 20 gallon with clowns

[jr2857]

do you think i can add 4 false percula clowns to a 20 gallon? the demensions are 30x12x12. the tank has live sand and an undergravel filter

 

[bigarn]

Only 2 occelllaris clowns in a 20 gallon. I'd advise you to get rid of the undergravel filter also ... they trap waste and become nitrate factories after awhile.