had some water quality issues when the tank started but got it all figured out!?!(thank you all AA people!) well because of the fluctuations i got a columnaris out break in the tank. i'm treating with Pimafix and on the second day of the treatment. all the carbons gone from the filters lowered the temp gradually and put in an airstone for aeration. thing is i have a gold claw crab in there. he looks alright doing his usual thing but what about long term? also my readings have been weird with the pimafix in there. is this normal?