lepto tissue decay

[GT350pwns]

I picked up a frag of Jason fox jack o lantern lepto from amother reefer about a week ago and it has developed some blackness (assuming tissue decay) along one side of the frag. What can be done to combat this?

Also, where should this frag be permanently placed? I've read quite a few contradictory tidbits and want to know for certain where it will be happy.

 

[Fish Biscuit]

Mine is in low light & low flow. I'm getting a good amount of growth in just the 3 weeks that I've had it.

 

[GT350pwns]

Thanks a ton for the reply