The angel can be mixed with other small fishes. But sometime, they will attack or just trying to bite the guppy tail. If your guppy got babies.. Angel will finish them into their stomach. That's why it is not recommended to mix with other smaller fish.

If you want something like angel. Try to get Altum Angel. It is quite pricy. but it is the real angel. And named as the Queen of Aquarium of planted tank. Mostly the lfs selling crossed breed Altum angel. If you want the real one, I can give u the contact number and u can call up the guy to arrange.

You can get red nose tetra, congo fish, rainbow fish, molly...etc. Those small fishes are best for community tank.

Red lobster for the tank. i dont think it is a good idea. shrimp is good. But you need to get those shrimp for planted tank. Not the normal shrimp... coz they will dig and eatign the plants.