Columbian Shark help.

[WWD]

I have posted a few times about different problems I have been experiencing in this tank. I have finally got it all sorted but I keep loosing my Columbian Sharks they last only a couple of days and die with white spots all over them. I though it was ick however none of the other fish are experiencing any problems. I have medicated with quick cure and run a higher temp. about 82 degrees. I have some sail fin mollies and some Monos as this will eventually be a brackish set up in a larger tank. They are all doing great. Any idea I have had 4 die now in this manner? I would realy like to grow some of these guys out but it is not working for me. I have not added salt yet as I would like to raise the salinity while all fish are in the tank.

Tank set up
55 gallon
2 AC 110
1 piece Driftwood from LFS
plastic plants

 

[Columbian Shark 3]

I have these fish how big are they when you buy them about 2"-3" correct?, same fish store each time?

 

[iloveoscars702]

if your getting them from the same store, stop buying from that store.

 

[Columbian Shark 3]

if your getting them from the same store, stop buying from that store.

Pretty much what I was gonna say lol yep if they are from the same store each times they have something in the tank

 

[komodo182]

what is your salinity level compared to the store? Any sick ones in the store?

 

[WWD]

I have bought them from 2 different stores, same result. My Monos are now showing signs of Ick I may have to take down the tank super clean it and start over if it wipes out my Monos. I am going to try adding salt tomorrow. The fish have all came from freshwater. Hopefuly the salt will work.