Take your time, research, read, think about it, reconsider, research some more, then go to the store.
green terror, oscar, jack dempsey, frontosa, convict, skat, var. puffers, mono, white tip shark, var. pleco, labs, neon tetra, cardinal tetra, discus, betta splendin, serpae tetra, mollies, pictus cat, otocinclus, blood fin tetra, cory cat, and anything else I forgot to mention.
To many to mention, all plant tanks running DIY Co2 systems.
fish don't need toys, get that crap outta the tank!
During the summer months, it may become more of a challenge to keep your aquarium temperature stable.
There are many different species of barbs but some of them are better than others for the larger home aquarium.
Cultivating a thriving saltwater tank can be a challenge but it is also incredibly rewarding.