I've had my betta (Comet) for a week. Over the past few days I've noticed the ends of his fins are becoming translucent. I'm usure if this is new fin growth, but I'm really worried that it could be fin rot.
He's in a 19 litre (5ish gallon) tank, with a filter, heater (temp between 25 and 27 celcius) & lighting (on for 8 1/2 hours per day). I set it up using some media from my coldwater tank (home to 2 happy, healthy orandas), and ran it for 1 week. Before I got Comet, I tested the water and got 0 readings for ammonia, nitrite & nitrate.
Since we got him I've done one 20% water change. And tested the water twice - both times all the readings came back as 0. The water PH is 7.4.
I feed him once a day, with a 1 day per week fast. So far he's had betta flakes & pellets, freeze dried bloodworm, daphnia, brine shrimp and tubifax worms.
I've attached a couple of photos - if they're not clear enough to tell, I'll take some more.
I can't tell if the fins are getting longer, or if the colour is draining from them. But I'm sure the ends were all red when I brought him home from the shop.
I'm feeling really anxious about him and quite dispirited about keeping tropical fish now :( Any advice would be greatly appreciated.