Sheesh....this is about my millionth question, BUT.....
I recently realized that my poor betta actually had fin and tail rot when I purchased him from the fish store (this store also gave me a lot of incorrect information and bad advice, so I don't think they were taking terribly good care of their bettas!), so I've been treating him with aquarium salt (I've ordered Melafix, but haven't used it yet, as the salt seems to be going well). I've also greatly increased my 100% water changes to daily or every other day, AND I've also recently changed his diet (feeding more pellets, incorporating bloodworms, and fasting once a week). He is certainly more active and happy now, but today when I was changing his water I noticed that he has a thin pink line of color on his tail that wasn't there even as recently as yesterday (Vern is mainly lavender and dark purple, but his tail, fins, and body have quite a bit of yellow mixed in as well, but no pink!). Is this a possible sign of illness or injury? He has a large piece of wood in his tank, and while it's pretty smooth, is it possible that he snagged his tail on it? Is there anything in particular that I should watch for with the pink line!
Yikes.....I sure hope my buddy's okay!!