I agree with the above. While the gourami and the pleco are small now, they will grow out of the tank at some point. With proper water changes you can keep them in that tank for a little bit.
I would recommend you get some quality food that helps with clear water to reduce the number of water changes needed.
A new company "Sea Diamond" makes a quality clear water formula food to assist with that. You cant beat the price for how long it lasts. A bottle lasts me forever. Here is a link to it: https://www.ebay.com/i/264088773561?chn=ps
All my fish love it including the pleco because it is an omnivorous diet for all tropical fish.
In the future you should definitely look to get a bigger tank, but for the short term get this food to lower the amount of water changes.