Typically most Bettas have what I like to call specifically an adjustmeant period. In which bettas adjust to there new habitat and try to get used to the new surroundings. Most likely you are gong to encounter more seviere cases in which the habitats changes in a very pronounced way, such as as large amount of plants to a small amount of plants or a tiny to a substantially large aquarium, such as a 2.5 to a 30 gallon long when these types of changes occur, the bettas behaviour changes negatively. Sometimes resulting in a lower immune system which is the main factors of fateful diseases such as ich, fin rot, and fungal diseases.
My recommendation for treating this "side effect" which has no true treatment but has a few ways that can easily eradicate all symptoms of stress due to moving. Usually adding many hiding places along with plants will have a good, impact in it. Heating the water a bit higher, keeping the flow minimal, and keeping the water pristine. Along with closely representing the previous home as best as you have the ability to do.
Though sometimes you don't need to take any precautionary steps to emilinwting the side affects, and leaving the Betta for maybe a small amount of a time span along the lines of around 1-2 weeks can be a typical period to expect when it should go away
Last edited by Mo; 03-27-2012 at 10:31 PM.