Here's my feeder tank with a couple of Walmart extras to keep it cycled lol. 



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nice tank, but how are you going to keep the catfish from cleaning you out!
Lol I know nothing about those cats but in reality if they eat the gold fish there going to a good cause lol I thought they looked good and I don't think they get that big. If they outgrow they'll go in my 180 and hope they make it past my cichla lol
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Those cats likely won't get bigger than 6". Odds are good they'll not bother your feeders, especially if they're well fed.
Check out their species profile on PCF:
http://www.planetcatfish.com/common/species.php?species_id=276
Sorry to hear. They are more susceptible to things like ich since they're scaleless. Keep an eye on the other one and make sure you don't see any outward signs or issues.