Need advice

[ehub88]

I have an 80 gallon aquarium that I want to turn into a brackish aquarium. I am struggling to find good information so I hope some one can help. My plan for this tank is to have a school of monos probably 3, maybe 5. I also want to get some small scaled archerfish. I wasn’t sure if it would be better to get only one or get a trio. Since I’ve heard they are schoolers, but Ive also heard they can be aggressive towards each other. Finally I want to get a green spotted puffer possibly 2. Would these three groups of fish work together? Also would I have a good amount of fish for each species or should I add more or less of one? Also any other brackish advice would be greatly appreciated since this is the first brackish tank I have done!