I recently had a bit of an algae outbreak and it negatively affected my fish.
I'm sure it was giving him some kind of problem which resembled Velvet, (he was kinda dusty and lethargic). I gave him a nice water change with some aquarium mineral salts and boiled the heck out of all the stuff in the tank.
I also stopped using the light because it leads to algae.
He seems better now overall.
But now that I don't use the light, I find he's a little more lethargic and just floats around.
Sometimes I tap the glass and get no response, leading me to think he's sleeping.
He has no visible symptoms of anything listed in any Betta disease FAQ's.
I will be starting a natural garlic supplementary meal soon though just in case, for parasites.
And...I just turned on the light and he's swimming around now some more.
I don't want to leave it on too long though because I'm afraid it will bring back my algae problem.
***So here's my question(s):***
How much direct light do they need to thrive?
Do they become listless with a lack of light and a little perhaps dopey or constantly sleepy? Kind of like humans and seasonal mood disorder.
Humans need light for Vitamin D production - is light somehow necessary for body rhythms and whatnot with Bettas too?
They are afterall tropical fish.