Household & Multi-Pet · Aquatic
Semi-Aggressive Fish Tanks
Managing Barbs, Gouramis, and Freshwater Sharks
Barbs, gouramis and freshwater sharks can share a tank, but only if you plan for their tempers. 10 lessons on the tiger barb pecking order and why small groups turn into bullying, the gourami labyrinth organ and the air gap under the lid, dwarf versus three-spot gouramis, the territorial truth about red-tail and rainbow sharks, breaking sight lines with wood, rock and tall plants, why long-finned fish don't belong here, rainbowfish as fast and peaceful schoolers, feeding so shy bottom-dwellers eat, spotting a bullied fish, and the time-out box.
About this course
Semi-aggressive fish are some of the most colorful and active fish you can keep, and most of the trouble with them comes from a few predictable mistakes. This course starts with tiger barbs and why a group of three or four ends up with a bully and a target, while a school of 10 or more in a tank at least 3 feet long spreads the chasing around. You'll learn how the gourami labyrinth organ lets them breathe air at the surface, so a sealed lid with no gap is a danger, and how dwarf gouramis at 2 to 3 inches differ from three-spot gouramis that reach about 6. Then come red-tail and rainbow sharks, which are territorial minnows, not sharks, and usually need to be the only one in a tank at least 4 feet long. The middle lessons cover blocking sight lines with driftwood, rock and tall plants, why angelfish, guppies and bettas don't belong with nippers, and why rainbowfish fit in. The last three are practical: feeding so shy bottom-dwellers get a share, spotting a bullied fish early, and using a time-out box to reset a bully.
What you'll learn
- Why tiger barbs bully in small groups, and how a school of 10 or more helps
- How the gourami labyrinth organ works, and how dwarf and three-spot gouramis differ
- Why a freshwater shark usually needs to be the only one in its tank
- Breaking sight lines with driftwood, rock and tall plants, and keeping long-finned fish out
- Rainbowfish as fast, peaceful schoolers, and multi-point feeding so shy bottom-dwellers eat
- Spotting a bullied fish early, and using a time-out box to reset a bully
Who this is for
Keepers who want a lively barb, gourami or shark tank instead of a quiet community; anyone whose tiger barbs are shredding fins or whose gourami chases everything; and beginners who bought a rainbow shark and want to know what it needs.
Course outline (10 modules)
Quiz & Certificate
Knowledge quiz
After completing all lessons, take a short quiz to test your understanding.
Go to quiz →Completion certificate
Pass the quiz and earn a shareable certificate of completion.
View certificate →Frequently asked questions
Ready to get started?
$9.99 · Lifetime access · 10 lessons