MurderComplication
Aquarium Advice Activist
Try to get two or three more Gourami's. They're very territorial and love to chase eachother when they get into each other's space. The more you add into your tank, the more peaceful they'll be.
The shark is (off the top of my head) about 2 inches right now.You might have some problems with the gouramis; it's generally suggested not to mix different types of gourami and they can often become aggressive toward each other, so just watch for that. As the shark grows (how large is it now?) it'll need a larger tank. Tiger Barbs can be aggressive to each other in small groups so you might want to get more of those. The pleco would need the driftwood to munch on for digestion.