01-22-2009, 01:24 PM
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I'll be a bit more conservative: plecos, while they are big fish and produce a heck of a lot of waste, don't require a whole ton of swimming room. I would say the minimum tank size for a 19" pleco would be a 180g tank, as this is the smallest standard size with a tank width of more than 18", giving the fish room to turn around. A 180g tank is 24" wide.
Of course, the bigger, the better, so a tank larger than this would certainly be appreciated. And, of course, with a 19" pleco in a 180g tank you'd need a truckload of filtration to handle his waste output.