09-24-2009, 03:30 PM
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Originally Posted by Byron
First on the water pH, if it is 6.4 out of the tap and 7.4 in the tank, something in the tank is adding mineral (probably calcium) to the water to raise it. This is not good. Normally this is caused by gravel or rocks, such as limestone, dolomite, coral, marble. If you have any of these in the tank you should remove them. The fish you list will be better in slightly acidic water in the mid-6 range. Fluctuating pH is very stressful on some fish. It may or may not be the cause of the problem with the one shark, but even if not it is certainly not going to help him.
The lobster may have a bearing; does it go after any of the fish?
Well. I was right. He didn't make it :(. I have regular blue gravel in there from the pet store that have been in there since I got the tank about 6 months ago. As far as the lobster is concerned he does not bother the fish at all unless they won't leave him alone. He lives with the pleco inside this log.