My family has quite the set up, when it comes to FW fish tanks.

My two younger brothers, my father and I all own a fish tank. My dad and I (yes my mother and older sister help, but it's kin of a boy thing) have a 120 GAL. tank with a Silver Arwana, 2 Parrots i've raised since 3", and the most beautiful FW fish in the world, a Red Severum.

My youngest brother, age 7, has a 14 Gal. Guppy and Danio breading tank. My other brother, age 12, has a 29 Gal. tank, which we call the "Schooling tank". It's got 3 Giant Danios (lost two because of Nitrite spike), 5 Skirt Tetras, 2 Male, 3 Female, and now today he brought home 3 Tinfoil barbs, that he picked up at Petco today on his way home from school.

I have 3 problems with this.
1) Petco? The fish there are ugly, and covered in Diseases.

2) How fast do they grow? They get HUGE, and I don't want him putting ugly fish in my tank (no offense :D)

3) Aren't they Semi-Agressive? I have a feeling they are going to tare the tank to shreds, fish and live plants, at about 5 inches. We have them with giant Danios and TETRAS! I don't like where this is going.

If you've got any knowledge on these Barbs, please let me know.

__________________
120 Gal. Reef tank coming this june. This is going to be awesome.

I would suggest taking the Tinfoil Barbs back, they grow about a half inch to an inch a month (at least mine seem to be). They will get 10+ inches and will need at least a 6 foot long tank to be happy. I had mine with smaller community fish before moving them to a bigger tank with two cichlids, and they were not aggressive towards any of the fish.

If your brother wants barbs, try Cherry Barbs or Tiger Barbs.

By brother just plans on putting the barbs once they get large, into our 120 GAL. So its not the size i'm worried about.

__________________
120 Gal. Reef tank coming this june. This is going to be awesome.