Omygoodness, so I should put 25 MORE Otos in my 29 gallon tank??
Algae is a plant, plants need light and nutrients to grow. If you are growing aquatic plants and they are growing well, most will outcompete algae and starve them of their nutrients.
If you have ALWAYS had bad algae, you have too much light or feed too much or are overstocked, or any combination of the above.
What is your ammonia/nitrite/nitrate readings? If you do not test your water, most fish stores will do it for you for free or a nominal charge.