In reply to Anonymous.

The rule s 1 inch of full grown fish per gallon of water. I have a 10 gallon tank yielding aprrox 10 inches of fish.

I have 3 Tiger Barbs and 3 orange Swordtails. The Swordtails are longer than an inch, and so is the larger Barb. Those 4 fish probably measure in at close to 6 inches. I have 3 smaller Barbs, but one died. My tank was close to the limit. Going over means that the water gets fouled very quickly, and that can cause fish to die as well.

Not sure why the big guy chose now to start being nippy.