Im thinking its a combination of light too close to the water and indirect sunlight reaching my tank. Right now the algae is a thin film on the tank walls. Im thinking either a toothbrush or a magnetic scraper although this gives me the perfect excuse to procure a nerite *laughs conspiratorily*
Hair algae can sometimes be cause by either-too high watts, light too close to the water, old light bulb-to name a few common causes-generally its a type of algae that needs manual removal on occasion since this is a closed system-but sometimes you can control it to a degree. I have used an old tooth brush and twisted/twirled it around the hair algae to remove.
Very true..it would be hard to get a pic, however, hydra generally are not harmful to adult Betta-they can kill fry and even give you a tiny sting-doesn't hurt too bad but it can startle you a bit...at least it does me.....
I'm not sure about the white algae, if you can post a pic I'm sure someone will know what it is. I have been seeing in my tank what looks like a clear piece of thin film with little dots or eggs on it. I assume it's snail eggs since it started after I got snails. Also, another advantage of snails is that they are sensitive to water conditions. When your water needs to be changed they will all go to the top of the tank to get either oxygen or to get out of the water, and they do this before the water starts to affect your fish.This morning I had about 75-100 snails at the top( I had no idea there were this many). I tested and nitrates had gotten high. I did a water change and within 15 mins they were back to the bottom.