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Anyone keeping/kept them? I posted about them a few months ago on P.fish.net but there was only one or two members who had any experience with them. what can they be kept with? if anything? All help would be greatly appreciated!

Depends on which species you have. I am currently keeping a few of the brown mottled species (maybe a <i>Pseudocetopsis</i>/<i>Hemicetopsis</i>), which is a smaller species said to be from Peru.
Very shy catfish, but great in the community tank.
If you're after info about the more common blue what cats, this thread has more info.

Is size the primary difference between the species? I am looking into all of the species, but the blue whale cat is the only one I have seen available. Thank you very much for all your help!

No, I think the blue whale cats are more active and need a lot more swimming space. Mine are always hiding during the day, but you will find that the blue whale cats are constantly swimming, even when seemingly at rest. They are also said to be more aggressive, but then I've never kept a blue whale cat.

You didnt happen to get your Pseudocetopsis/Hemicetopsis online did you? how much do they commonly run? what are you keeping them with? Again thank you for the help!

Got mine online a long time ago. They don't seem to be offered again, which is a pity, because I would like to get more (the six I initially had has dwindled to two or three).
I am currently keeping them with a mix of tetras, aspredinids, <i>Parotocinclus</i>, and <i>Chiloglanis</i>. No problems there.

Silurus wrote:No, I think the blue whale cats are more active and need a lot more swimming space. Mine are always hiding during the day, but you will find that the blue whale cats are constantly swimming, even when seemingly at rest. They are also said to be more aggressive, but then I've never kept a blue whale cat.

I bought two "blind blue whale cats" some time ago. Pics are/were up on this forum somewhere. Silurus had them identified as a Psudocetopsis species. They were extremely reclusive and inactive. Kept them with Chiloglanis and some other small fish, which the Pseudocetopsids never bothered. Ultimately they succumbed to what appears to have been some kind of gill fluke.

Dinyar

I love my cat. I had him with other healthy (larger) fish which some of them he killed. I should also mention again that he has an entire row of teeth. I have him in a thiry gallon by himself. He is a few inches long. I do not keep a light on him. He is always swimming with his belly to the side of the tank. I feed him blackworms which he can suprisingly eat a lot of. He is pretty cool, when he sees me putting them in there, he starts swimming like mad right through them a couple of times, and about on the fourth round he will start eating, twisting in every direction. He has never been sick. He is my favorite cat, active, and interesting to watch whenever.

Britt

I hope this helped a bit.