Small Betta Tank Question

You shouldn't be too worried about some algae growth in his tank unless you notice he's acting/looking different. How many gallons is it again?

Yeah, I was going to recommend an oto or 2, but unfortunately thats too small.
Pretty much you'll just have to keep scraping and doing water changes like you have been doing. And keep an eye on George for changes!

Yeah, those smaller tanks are exceptionally difficult to control water conditions in. A slight imbalance could contribute to unsightly algae. The good news is the algae will use up some of the toxins in the tank as a food source. The bad news is there is enough extra nitrite, nitrate and ammonia present for algae to grow. I've tried bettas in those smaller tanks before and even with filters etc. it was still a challenge to keep the tank clean and clear. If you have a test kit, start testing that water. You may need to step up water changes to something like every other day in something that small. Also, algae needs light to grow. What kind of light is this tank recieving? If it gets any sunlight, that could be a major contributing factor. Not trying to be rude or anything, but having dealt with smaller tanks for bettas in the past, I wouldn't put one in anything less than a 10 gallon anymore. That's just me though, maybe, I'm picky and I know plenty of folks that have 2-5 gallona betta tanks that they handle just fine.

you might be overfeeding, that can contribute to algae growth. How often are you feeding him? I feed mine only two or three times a week.

B THE B The surface coating is protein scum mainly, if the water doesn't move it happens a pain really but try agitating the water each day to displace it it may slow oxygen absorbsion to the lower levels of water.

hmm, I use bloodworms too, but I don't know if only 2 a day would be overfeeding. It is a good idea to skip feeding on one day of a week at least, to give their digestive system time to clean itself.