hi i have a problem due to the new fish been added to my tank my water quality has all gone out thw window. Now i have noticed my fish starting to flick alomg the rock and the sand and am now worried something is not right in the tank. One of my hongis looks dull and its got this weird twitch its doing sometimes it loos like it dont want to swim and just floats around so i thought i would do i 40% water change a last week still the levels are really high so i got some stuff to put into the water its called amQuest + im sure thats whats its called been told it will help with all my levels and bring the down the fish look a little better but still they are flick along the rocks and sand anything else i could do to try and help them out ?