$10-$20 so it's a very good idea. 
While you're at it, I'd suggest Selecting a microscope. You can get a perfectly acceptable toy scope for $10-$20 that'll let you view up to 1200x and to become capable of solving a lot of mysteries in your tank.

While you're at it, I'd suggest Selecting a microscope. You can get a perfectly acceptable toy scope for $10-$20 that'll let you view up to 1200x and to become capable of solving a lot of mysteries in your tank.


