Sorry if i ramble a bit...
when i got my betta (5/6 weeks ago) i noticed one of his fins (a little one by the side of his body, i think its called a pectoral fin or something? :/ ) was about half the size of the other. I thought it was just a stunted fin or something but a friend said (about 2 weeks after i got him) she thought it might be finrot so i kept an eye on him to see if it would start to grow back on its own. Apart from that fin he seemed great, he was active and he'd come up to say hello if someone came in the room and he gobbled down all his food.
Then his proper fins started to look a bit tatty round the edges and the bottom one started to look paler. I bought 'King British fin rot & fungus control'. I used it for a week but he seemed to be getting worse, he was looking like a delta/crown tail but when i got him he was a super delta. He was also starting to get a bit lethargic.
So i went and bought 'Myxazin fin rot & bacteria' to use instead. I left it 48 hours between swapping and monday was the last day of the 5 day cource the bottle says to do. However he is looking worse and, although he eats and comes to say hello if he notices your there, he spends a lot of the time at the bottom of the tank with his head buried in my moss ball (i assume because its dark).
His in a 19l (just under 5 gallons) tank with filter, heater (80F), a moss ball and what i think is egeria densa (plant). I also have a couple of ornaments and silk plants i swap and change round when i do a water change (i do a 20% change once a week). Theres also quite a few ramshorn snails in there. The waters fine apart from being a bit hard. I feed him Hikari betta bio-gold pellets 4 times a week, freeze dried bloodworms twice a week and nothing on mondays.
Anyway, what should i do now? should i continue with one of the medicines? or shall i leave him without for a while to see if that helps? Should i turn the tank light off for longer so he gets more sleep? At the moment its off overnight for about 9 hours