my shark

here's a pic of my shark, recently turned agressive(since redecorating) i've had it for well over 1 year, peaceful loving thing, anyone have any ideas what happed?

That is a lovely fish. Can you give us some more information like the tank size, tank mates, what changes you made to the tank and who he is being agressive with...

ALASKA

my tank is 55 gal. he lives with platies, tetras, siler dollars, corys, mollies, killie fish, gouramie and some zebras.
he is very agressive with my silver dollars, one of them is almost dull in color, just a little bit shiny. my shark chases away anyfish that go near it. i removed everything in my tank, and placed it in diffwerent spots to give them more room to swim. i hope this helps

wut kind of shark is it

You may have removed his way to "hide" and avoid eye contact. Along with that you probably messed up his "territory".

Make sure they have places to go that they can avoid eye contact and give him time to re-establish his terrirtory and it might go back to normal.

Gathered from Aquarium Central
red fin cigar shark


Leptobarbus hoevenii

Common Name(s): Red-Finned Cigar Shark; River Barb; Sultan Fish
Family: Cyprinidae
Originoutheast Asia
Max Size: 20"
pH:Neutral
Temp:74-80 F.
Tank Size:150 Gallons
Feeding:Omnivorous

Leptobarbus hoevenii, commonly known as the Red-Finned Cigar Shark, River Barb or Sultan Fish, is a slender Cyprinid from the fast-flowing open waters of Thailand, Sumatra and Borneo.

The body is sleek and built for speed. The caudal fin is deeply-forked and helps propel the fish to outstanding speeds in its native waters.

Tank Setup

The Red-Finned Cigar Shark should be kept in a large aquarium measuring at least 6 feet in length. These fish travel in schools and thus should be kept in groups of 5 or 6 in the aquarium, meaning the tank must be very spacious. Because their natural instinct is to dash quickly away from danger, they can often be timid fish in the aquarium. For this reason they should be provided with solid structures for shelter such as tall rocks and driftwood pieces. In the event that the fish gets startled it may injure itself on sharp decorations. Plants also make good decor in the Cyprinid aquarium. Use a tight-fitting canopy as this fish is a jumper. The fish appreciates strong water current which can be achieved through the use of a power head or similar device.

Feeding

Red-Finned Cigar Sharks are omnivorous feeders and should be fed a balanced diet of both meaty and green foods. Prepared foods such as flakes and pellets, as well as vegetable matter such as algae tablets, blanched lettuce and peas are all ideal foods. Live foods are highly appreciated.

Water Chemistry

H. hoevenii is a hardy fish that will adapt to most aquarium conditions so long as they are not too extreme one way or the other. A neutral pH and water hardness up to 10 dH are recommended.

maby i messed up the territory, my shark never liked to hid very muck, i have large plants he can hid in but he spend his time chasing and raming my siler dollars. i'll wait another little while then if not better i might have to find it a new home. he is kinda big for my tank. thanks for the info

No Problem GTH