hey..I have a 75 gallon tank.which everybody know aready..anywase..I only have to male koi in there..One koi is alilo smaller then the other one..The smaller one is 4 inches and the bigger one is 5 or 6 inches..every thime I'm done feed them..the smaller one alway's bit the other one fin...So i call the LFS and they say bcuz i don't feed them eoungh..but..I donno if i should take the Lfs adivce or not..So..why do my koi keep on bitting eac other fin..my water is Good..not wrong with..

Ricky chances are that they are not doing well in the tank. Koi are not tank fish. They need 250 gals of water each. So you are keeping them confined to way to small of conditions. The can be territorial, which isn't good.
I would recommend getting either a large 100 gal tub to house just one in or turning them into the store until you can get a pond.

I understand that koi is not tank fish..I going to get a pond soon..75 gallon is not big eoungh fort them??I only have two only..Thanks for ur adivce..

Hi Ricky,

Try feeding them three times a day, add in fruits and vegies to there diet. Fresh or frozen, not canned. Peas, skin removed. Green beans, broccoli,cauliflower,carrots should be steamed, the carrots and green beans chopped bit sized. The rest can be fed useing a food clip to hold it in place. Zucchini or yellow squash.

Grapes,Oranges with skin removed, watermelon, remove seeds also. Kiwi fruit, banana's.

Its a trial and error thing too, some things they will love and others they won't.

Salad or cocktail shrimp and Tuna are good for them also.

Well..I do feed them like 2 or 3 time a day..Wow..They alot of new food they i never heard of giving to koi or goldfish..Only peas..anywase..One Q's..I bought some peas that is in a can..but...the can's ingredients say no salt added..only water and sugar..is that okey to feed my fish..bcuz it don't have salt in in the can??
Anywase..Thankyou..I need more adivce..plzzz..

Oh..more thing..Sorry i post two time..anywase..U say I can feed them cocktail shrimp>>how do i feed them?/should it be cook or raw?/and do i feed them the whole shrimp peice or cut into lilo peice??

salad & coctail shrimp should be cooked. While they are small, feed them smaller bites they can eat, as they grow, since the shrimp is a small type, then later on they can eat them pretty much hole. As long as there's no salt, the salt will burn them inside and cause internal problems. Sugar isn't the best thing though either. Frozen and fresh vegies are the better ones to go with really.

Do make sure they get some fresh fruit to, they need vitamin c just like people do and fish can develope scoliosis like people do! A blalanced diet is a good thing for them!