Welcome to the forum! I don't think your overstocked. Your tank maintenance schedule is good! If it was my tank (and it's not) I wouldn't hesitate to add a few more tigers and hatchets. I don't know a thing about gouramis so I'll leave that for someone else to comment on.
As you have the room, definitely more hatchets. I assume these are the common Silver Hatchetfish [click on the shading to go to this fish's profile] since these will fare better with the barbs that the more delicate Carnegiella species. And being shoaling fish, like all characins, the more the better; six minimum, but as you have room I would go for more and add five more to total nine.
I would not advise gourami with tiger barbs. Gourami are all sedate easy-cruising fish, and too much of a temptation for nippy tiger barbs. The Bolivian will probably stand his ground, but I would be careful; this fish is also "easy going" and over-active tigers that decide to bully him may cause health issues for the Bolivian. Especially as he grows and, if a male, develops the fin extensions.
Byron.
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Related Threads
?
?
?
?
?
Tropical Fish Keeping
597.8K posts
83.7K members
Since 2006
forum community dedicated to tropical fish owners and enthusiasts. Come join the discussion about species,breeding, health, behavior, aquariums, adopting, care, classifieds, and more! Open to fish, plants and reptiles living in freshwater or saltwater environments.