12-23-2010, 01:52 AM
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I don't know about the plecos or gourami, but I'd certainly reduce the number of platies to 3. I had 5 in my 75-litre (about 20 gallons) and the scale of them after they'd grown (mainly the females, they get very big) made me upgrade to a 165-litre (about 45 gallons, I think). I've got 6 in there (+ 2 tiny babies, just arrived!) and I can't imagine having that many in a tank smaller than mine. I think 3 would be a good number, judging on how mine look and taking into account that your tank is a bit smaller. You'd still need to consider whether the other fish will have enough room before you make your final decision, but just on platies, I'd go with 3.