So in my moms betta tank there's been some algae growth, so I put a drop of some stuff to eliminate the algae and we were watching the tank and hundreds of these thread like worms came out and started squirming around. I did a google search and I'm assuming its harmless planaria. A few minutes after they came out they were gone, so Im wondering if maybe the algae medication bothered them or killed them? We had never noticed them before