My betta has been in a small tank for a month now and on the last week of that month, I went on vacation and left my betta with my uncle. I asked him to clean the tank while I was gone (It was already starting to get dirty) but he ending up not doing it. Anyways, my betta has been staying at the bottom of my new 10 gallon tank ever since I put her in there today. I'm not sure if it's because of environment change or the new filter, or if she caught a disease due to the stress from the car rides to my uncle's house and back + the dirty water. I noticed that she had a lot of small dots on her body and top of head, but not her tail or fins. I'm not sure if you can see it in this picture but I'll post it either way.