Rosaline Torpedo / Hongkong torpedo

i have two in a 30g tank. initially they hung out together, now one os dominating and chasing the other one...even bit its fins a bit. they are barbs....is this normal behavior for this kind of fish. when i bought them, i was told to keep them in pairs....but now they are pretty much single.

Torpedo Barbs are a schooling fish and are thus happier in a group of at least six. If you have only two, they will start to get territorial as they mature. In a large group, they tend to not be territorial. At maturity, they can be six inches long. A half dozen fish that size are probably too much for a 30 gallon tank. One of the sources on Google said they are new to the hobby, so you may want to do some research.

Thanks for the info. I plan on adding few more torpedos to balance it out. the two i have grew to 3 inches in the past year or so.
Have a Happy New Year!

Is the Roseline... is that the common name Roseline Shark?

If so... these are very nondominant fish... They can be abused by other fish and have a really rough time.

Even if they're bigger. I lost mine due to some other fish getting excited during feeding time...

That is correct. it is the same fish. i found the following on another website. i guess they like to play.
Care: The roselines prefer a tank with a decent current, which will highly oxygenate the water. They also like a tank where they have a lot of open swimming space as well, and thick plants to play tag in. They also seem to know how to play hide and seek as well - where one would take off, and the others would search him out. They don't seem to make much out of my rock caves, but as for the driftwood, they so like to chase each other around the larger driftwood, as well as through the branches of the smaller, preying mantis-looking driftwood with branched legs.