when you say gouramis are you thinking dwarf gouramis?
it will help determine what if any angels you can add to the tank.
a 70 is a decent sized tank..if you introduce angels to that tank..depending on how many you could wind up with a few pairs..then that tank won't seem large enough.
angels may mix well with some gouramis..so research the species of gourami. keep in mind some gouramis don't do well with others if the same species. particularly males.
it will help determine what if any angels you can add to the tank.
a 70 is a decent sized tank..if you introduce angels to that tank..depending on how many you could wind up with a few pairs..then that tank won't seem large enough.
angels may mix well with some gouramis..so research the species of gourami. keep in mind some gouramis don't do well with others if the same species. particularly males.