Clown Knife Fish acting strange

Question
My Clown Knife fish was found laying curled in half in his favorite rock. We thought he was dead, but he started swimming, (wobbly swimming) we dont know what to do about it, there is no ammonia, but the Ph is a little high. It is a 20 gallon tank, which also has a tri-colored shark, and a lyretail swordtail. The temp is kept at a bout 76-78. Lately, there has been a orangey-yellow algae growing on the rocks. What should I do?

Answer
Hi Ian,
This is particuallary strange. It sounds like you have a bacteria problem or your fish has swim blatter disease (not really a disease). I suggest doing 25% water changes every day until your fish looks better if it dies or it jst stays at the bottom it probably has swimm bladder problems. If it dies it could of been a bacteria problem.
I hope I helped,
          Samantha