Hello everyone, i just bough a frontosa 5 days ago, he in a 75 gl tank with 4 blood parrot and a ghost knife, all the other fish are well but the front for some reason he keep gasping but he still eat and swim around slowly sometime, most of the time he hide in a cave, my tank is running for about 2 weeks with 75gl filter and i hve air flowing real good, the water is clear but do hve little bit alge on glass, temp is about 76 F, please give me advice on what to do, please keep in mind i have a blck ghost nd he sensitive to chemical nd salt,also please tell me how to test nitrate, ammonia and ph, thanks in advance.