on MFK, i got the OK to add an abk or a hypostomus punctatus. im not discrediting you, im simply saying that i like getting multiple opinions... however, the pleco was iffy, so i definitely wont get that now. and, ill probably get the single blue gourami.
I also got my info from this page on MFK. It says 50 gallon minimum. But I guess they do grow slowly.
I also thought that hypostomus punctatus was the name for a common pleco? As in gets huge pleco. SInce you already have 3 plecos I think it's good that you don't get another, especially a huge one.
I think you need more mid swimming or upper swimming fish. The bottom seems a little crowded IMO.
I think the gourami would be fine.