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I started with 2 Pictus, an unidentified Pleco and a Pimelodus blochii (which was incorectly being sold as Pimelodus ornatus) in a 30 gallon tank. I now have the Pleco and the Blochii left.

All was well for the first day or so but the Blochii soon began to claim dominion over the tank. A week after introducing the Blochii to the tank both Pictus developed Ich and have since succumb to it. I am in my fourth day of treatment and have not seen any signs of it in the Pleco or the Blochii and am certain that it was caused by the stress of being chased..

My wife and I both have an infatuation with Pimelodidae, and are extreamly fond of the Pictus, but we are affraid of introducing any more to the tank for fear of too much stress caused by the Blochii. I don't want to get rid of the Blochii, as I have grown fond of it, so I would rather try finding suitable tankmates that will not stress so easily.

My tank details are as follows:

Temp: 78' f
Ph: 7.0
Gh: 9'
Kh: 5'
Ammonia: 0
Nitrite: 0

Im not sure how big your blochii is but you could put some of the more peaceful Archocentrus cichlids (sajica, myrnae, nanoluteus, cutteri, etc) or Thorichthys (meeki, helleri, aureum, etc). If you want schooling fish, its going to be tough in that small of a tank with a cat with a fairly good sized mouth. Aussie rainbows or big giant danios would work for awhile if the cat is small. Anything that maxes out under 5" and is fairly tall (gourami, etc) would probably work. You just need to pick what you like.