Originally Posted by Tommasta
Thanks Russell! After reading up on columnaris, it seems like the likely culprit. Tomorrow will be a hopeful trip to the LFS
Many of the Sun catfish offered for sale are indeed quite small, maybe three or four inches.With proper care, they along with the Sailfin Pleco, can reach between 12 and eighteen inches much too large for 46 gallons. Have seen the sun Catfish and other species that require large swimming areas ,damage their snouts by running head long into the ends of the tank.(Too small) This can lead to damage, and if water qualtiy or lack thereof ,becomes an issue then bacteria or fungus can develop.(Maracyn Maracyn II)
Rope fish can also grow fairly large, and Raphael catfish can reach seven inches.
If the fish listed have been in the tank for six months to seven months, considering the size usually offered for sale,, I would expect them all to be around six inches or larger. As fish continue to grow,,they eat more and create more waste.
Excess waste will compromise water quality and were it me,,(and it ain't) I would be performing at least 50 percent water changes each week.
I pray it is not Columnaris for if so,, there is fairly good chance of loosing all of your fish.
These fish, in my opinion,, will do poorly with any detectable levels of ammonia or nitrites,and nitrAte levels should be kept as low as possible.(10 to 20 ppm)
And with possible exception of Rope fish,, (not sure) need oxygen rich water with moderate current. Think airstones, and possible powerhead(s).
They will need much larger tank sooner,rather than later.