If I have 30 gallons then according to the gallon rule I can have 30 inches of fish?
So my 5 ember tetra combined is a maximum of 3 inches,
My 4 cardinal tetra combined is a maximum of 2 inches,
My 3 pandas combined in a maximum of 4 inches.
2+3+4= 9
This leaves me with 21 inches of fish to...