You're buying several varieties of fish at PetsMart and the employee asks, "What size is your tank?" You respond, "Which one?" The employee responds, "Never mind."
I found this one at Fishchannel.com
When in doubt, Partial Water Change!
75 gallon ~AquaClear 110, Harlequin rasboras, Cherry barbs, Tiger barbs, Otos, Kuhlis, Rainbowshark.
10 gallon ~AquaClear 30, Guppies