Hi all,
I am new to this so please forgive any mistakes. I am very confused about how many fish we can keep in our 90l tank (think that is about 23.77 gal). It is my sons tank an Aquastyle 620, sixe 62 x 38 x 53cm. He currently has 5 Black Wido Tetra, 7 Black Neon Tetra and 7 X-Ray (Pristella)...