Originally Posted by b3noodles
There are many different test kits available but I would highly recommend >>Salifert
<< for these kinds of tests.
And my Heni butterfly and scooter blenny has since passed away. So I only have 2 clowns a yellow tang and a royal grama. None of my fish are aggresive either I never noticed it anyway. My clowns are small only about 1 1/2 inches and royal grama is just a tad smaller. Thanks for the advice all! Sue
Very sorry for your loss
Although it may seem like it's fine now, the tang will grow quite large and for now may be fine in a 55 gal
but I urge you to consider a larger tank as the fish grow. The minimum recommended size for 1 tang is 75 gal
/4ft. They are very active swimmers as well.