fantails bahavior

Question
QUESTION: hi my name is karla

I have a female fantail she is a 1yr old and I been noticing that when she comes in front of the tank she moves so weird like her muscle moves, today I asked someone in Petco and they told that is normal, but my fish does it everytime, please can you help me this is getting me worry.
thank you.

ANSWER: Karla,
There are many different kinds of fantail fish. Are we talking about a Betta, goldfish, guppy...? Once I know what kind of fish you have, I can help you better.

---------- FOLLOW-UP ----------

QUESTION: Hi again:

well she is a fancytali goldfish and everytime she comes in front of the tank is like she shakes, she does this all the time. It is normal?

thank you one agian
karla

ANSWER: Does it look like she is trying to scratch herself on the gravel or decorations in the tank? Some fish do tend to "vibrate" more than others, but as far as it being normal, I have never heard of that. Are you you doing your weekly water changes, and using a good water conditioner? Have you changed her food in the last few days? Has anything  hit her tank, or a loud noise in the room? Sometimes when this happens, the fish hear and feel it and will be shaky for a few days, especially if something either landed in her tank, on her tank, or around her tank.

---------- FOLLOW-UP ----------

QUESTION: hiagain

well let see I changed her food from green peas to shimp, can this be the problem why she is acting like that? and well I do the daily check, I check her fins and everyting and yes they have a good conditioner with Aloe vera.

Answer
Usually when a fish does this, there is a problem. Most of the time is it something that we have done that has either caused the fish injury or scared them. Make sure you are feeding a good quality goldfish food since you have a fancy goldfish. I would also check your filter to make sure it is working properly. There could be an electrical short that is causing this. I see it mostly in tanks with heaters, but filters can also do this.