Algae on Beta Fins

[lwhite281]

I have a male beta in a 2.5 gallon tank. The only thing in it is a heater. he seems very happy in the tank. He creates bubble nests that that cover the whole tank at the top.
I noticed about 4 days ago that he had this bright green on the tips of his fins. I realized it was algae from one of the plants in the tank. That plant looked like it wasn't going to last much longer so I took it out. There is only one other plant in the tank and it it's never given off algae the way the other did. I did a partial water change when I took the plant out and the algae came off of his fins and appeared to be going away. I came into work this morning (where I keep my beta) and he has the green algae on his fins again. I have no idea what the cause of this is. I took the plant out that was initially causing the problem.
Do I need to do more than a 20% water change on his tank to get rid of it? Does anyone have any ideas of how I can keep this algae from attaching itself to my beta?
The picture isn't very clear, but if you look close enough you can see the green algae I am referring to.

 

[Zagz]

The plant wouldn't give off algae, algae forms on the plants. Don't know if it is algae on your betta, I would doubt it. But you should be doing at least 50% pwc on that size tank twice a week IMO.

 

[lwhite281]

I came in this morning and he doesn't have the green stuff on all of his fins like he did yesterday. He has it on one fin only. So I guess the stuff is falling off. It doesn't seem to bother him. He still has a huge bubble nest going at the top.
Thanks for your advice. I'll start doing 50% water changes twice a week.

 

[An t-iasg]

I had a similar situation once - I thought my betta had green algae on his fin tips. I did have a lot of algae in the tank at the time. He may have rubbed across the algae with his tail. This was in a hex tank that I found hard to clean well. For your situation, I agree with Zagz that a 50%, twice-a-week water change schedule would be best.