His acting weird and i dont know why... his been swimming around like crazy... he seems like chased by a dog... every time i go near the tank and observe him, he swim fast around unlike the others... i need help ASAP...
I would second the above poster. Get info on the water parameters and let us know how long this tank has been up and running with your currently stock (and what is your other stock).
Cycled? Filtered? Heated?
What are your parameters (ammonia, nitrite, nitrate)?
What is your maintenance schedule like?
What size tank?
What is your complete stock list?
Any physical abnormalities?
Is it still eating and poo'ing?
Any new additions?