Castiel (yes, from Supernatural) is the first betta I've ever had... I've had him for about a month now, and he seems to be happy. However, I've noticed his fins looking a bit raggedy, lately.
Yesterday, I did a 75% water change and added a couple tsps of dissolved salt to the tank. As of 24 hrs later, the parameters are super clean: ammonia and nitrites are at zero, and the nitrates are even 0-10ppm. It's the cleanest water I've ever tested, in fact. The tank is a fluval flora 8g and he's the only resident (aside from some plants).
I'm not sure if he has fin rot or if maybe his fins are getting caught in the filter intake. For whatever reason (adrenaline junkie?), he likes to play around in the outtake and & intake (they are right next to each other). He even builds his bubble nests behind the outtake and next to the intake. I've seen his fin get caught in it before, but only the one time. Is there any way to tell if it's one or the other?
You should know that I've been battling a green algae bloom, because of the placement of the tank- it gets a good amount of natural light in addition to his tank light. I've been leaving his light off for half the day, so his light is on about 4-5 hrs tops during the day.
I don't think I overfeed him- 1-2 pellets twice a day or 1 bloodworm and 1 pellet, and I fast him once a week.
Any advice? Pics below:
When I first got him:
About 2 weeks in: