06-27-2010, 12:09 PM
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Common names can be misleading, but if this "Royal" pleco is Panaque nigrolineatus then I agree with 1077. It gets much too big to be in a 3-foot tank (the 33g is presumably 3 feet, mine is) for more than a few weeks, and it is aggressive with its own species. It won't even be able to turn around in this tank when it is full grown, if it should reach that stage.
Fish grow all their lives, unlike us. As the fish grows it not only becomes larger (or should), it develops internally. The organs need to grow properly, or the fish will be what is termed "stunted" and have innumerable health problems and often significantly shorter lifespans. Potentially large fish must be provided adequate space from the start. It is not only the physical "space" but the water quality associated with that space; the smaller the water volume, the more biological issues there are, and while you and I may not "see" evidence of any of this, the fish live in it and do.
My suggestion would be one of this species in a 4-foot or larger aquarium; a group I would not suggest without much larger tanks.
I am sorry to "rain on the parade" but the health of your fish is our prime concern, and I (like 1077) want to be helpful to that end.