How long does cycling typically last?You will want to do more water changes in order to bring that ammonia reading down.
I don't know if you've had a chance to read this, but it may help;
Change half the water when either ammonia or nitrite approach 0.50ppm (alternately, 25% at 0.25ppm), or weekly, whichever comes first. Add Seachem Prime at 2-drops per gallon of tank size every day until cycled. That’s all you have to do. You can stop reading now. But there’s a lot of...www.bettafish.com
I was just searching the forum about this. I bought a 1 gal to quarantine him further. Perhaps the substrate and live plant might be bugging him.There is always the possibility he suffered from some sort of injury before you got him. Or, he could have a tumor.
Have you done Epsom Salt baths? One table spoon plain, unscented Epsom Salt (well dissolved) per gallon. Place him in the solution for no more than 10 minutes. Monitor constantly for any signs of stress and remove immediately. If he was not stressed you can try again the next day.
You might not see any improvement or you might not see it immediately.
These heaters are a mystery, eh? Would you mind telling me what brand you 5w is?I use the 5w flat heater in my 1 1/2 gallon. It keeps the water right a 78 depending on my home temperature if my house is a little warmer it sits more at 80 I tried the 15w but it started to heat beyond 80 degrees.