01-25-2010, 04:49 PM
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Parotocinclus, Otocinclus, Corydoras, Aspidoras and Brochis are, although in two distinct families (Loricariidae and Callichthyidae), very similar with respect to water parameters, behaviours, spawning methods and maintenance. Social by nature, they are more comfortable and thus less stressed in groups. As P. jumbo, in spite of its name, is small (up to 2 inches) a group of 3 would be fine in your 29g. As you note the upper temperature is given usually as 79F, and warmer temperatures mean less oxygen, but as this species comes from the slower streams this might not be significant with one degree.
It likes to bury itself in the substrate if alarmed, and remains more on the substrate that related species, so sand may be a better substrate. They are vegetarians, so edible algae (the common green or brown) in the tank when they are introduced would, as for all species of otos, be highly recommended, else they many starve. Once settled, vetable foods and spirulina/algae tablets will be eaten. At least, so the authors say; I've not kept this particular species. Apparently some authorities believe this species should be moved to a different genus, so a name change may occur if this is done.
I have tried a couple of other rare Parotocinclus species--easily recognized from the near-identical Otocinclus by the presence of an adipose fin in Parotocinclus, no Otocinclus has an adipose fin--without success. They are not easily acclimated to aquaria that are not well established [similar to the Otocinclus species]. Acquiring them as a group might lessen this, rather than single specimens. I may have been unfortunate enough to have acquired poor fish; all of these species are not the strongest during capture and transport and frequently arrive almost starved.