Pleco Fin Problem

[world_wide_wilson]

My pleco's tail fin has been eroding away over the last month. All the other fins seem to be fine. Any ideas? Pic attached... Thanks

 

[pippoodle]

i answered in your other post that you need to give the following info before we can establish what could be causing the problem

COPY from other post

can you answer a few questions hun to give some more info
tank size
ammonia
nitrites
nitrates
tank mates
temp
length and age of fish

thanks Sarah