02-25-2010, 11:51 AM
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Originally Posted by wh1989
Are you aging your water before performing the water changes? If not, you should give serious consideration to setting up some kind of receptacle where you can age your water for 24 hours to degas it prior to doing your changes.
Considering the time of year and what you described on the fins, it sounds like your fish has gas bubble disease. Try doing a google search for gas bubble disease. You'll find plenty of info. Only way to prevent this is to age your water.
The shark may be nipping at fins, but nipping does not cause the blister you described to form, so you have two issues here.
You could be right with regards to gas bubble disease considering that the filter (aquatech 30 /60) was reported in another thread to not be working properly and thus providing little in the way of oxygen exchange.
Heating ,aerating,and storing change water would be good idea.
Improvement in fishes seldom happens as quickly as we would like. I would be patient and observe the fishes for a week or two perhaps longer.
My own expierience with regards to fin nipping has shown that nipping can and does sometimes cause tiny blood vessels that pass through the fins of fishes to become ruptured along with the thin membrane that surrounds the vessels. If water conditions are good ,fins can heal in a few weeks. If water conditions are suffering ,then these areas can become infected and or blisters can indeed form.
I am in agreement that two issues could be at play but it seems one,,has been eliminated. would also urge the Original poster to invest in a new filter as suggested in another thread regarding same.