750 Gallons Vs 1 Kilo of fish

Here is my 750 gallon (10’ x 4’) consisting of mainly cichla ranging from 16“ - 26“ Also houses my two Niger cats at 2’ and nearly 3’ my Aimara at 20“ and two P13 and one P14 aswel as the 24“ Asian aro and 16“ giant gourami. Here they clean up a kilo of fish in three and a half minutes!!