This article details the process of setting up a 20-gallon aquarium for multiple betta fish, highlighting the challenges and successes encountered along the way. The author's journey begins with a trip to the pet store to source essential equipment, including tank dividers, a new internal filter, and decorations. Initial setbacks, such as limited stock and unexpectedly high prices for dividers, are documented, reflecting the realistic hurdles of aquarium setup. The account provides a candid look at the practical aspects of creating a multi-betta environment, from installing dividers and cycling the filter, to the emotional impact of unexpected pet loss.The transformation of the 20-gallon tank into a thriving multi-betta habitat is described step-by-step. From overcoming the challenges of fitting pre-purchased dividers to the careful acclimation of the betta fish into their new home, the author shares both the triumphs and disappointments of the project. Ultimately, the article offers valuable insights into the complexities and rewards of creating a successful multi-betta fish setup, demonstrating resourcefulness and adaptability in the face of unforeseen circumstances.
Read more: Fish Tank Dividers: A Comprehensive Review of Types and Uses
Acquiring the Essentials: Tank Dividers and Filter
My journey to creating the perfect multi-betta fish setup began with a trip to the pet store. The primary goal was to find suitable tank dividers. I located some, but they were more expensive than anticipated at $16 each.

Discovering only one divider in stock was disappointing. I opted for two for now, planning to purchase more later. Simultaneously, I needed a new filter for my 20-gallon tank, as the old one had unexpectedly malfunctioned.

In the store, I also found a powerful internal filter, a new type for me. This seemed like a perfect replacement and a great opportunity to try something different.

Decorating the Divided Betta Tank
After securing the tank dividers and filter, I moved on to decorations. The selection at the first pet store was somewhat limited, so I only purchased a few simple decorations.

My next stop yielded a small bag of fake plants – a temporary solution until I can acquire live plants. The price and selection weren't ideal, but it was a start.
At the first store, I also picked up some globe pebbles for the tank bottom, hoping to add a touch of elegance with the black substrate.
Tank Setup and Unexpected Loss
Back home, I began setting up the 20-gallon tank. I installed the new internal filter, adding the old filter cartridge to it to maintain beneficial bacteria. This was a clever way to jumpstart the cycling process.

The tank divider installation proved unexpectedly tricky. The dividers were too long and needed to be cut to fit. My cousin Frank helped me with this, eventually achieving the desired setup.

Sadly, there was some bad news. My black shark, a beloved pet of six months, had unexpectedly passed away. This was a tough loss, and I am still unsure of the cause.
Adding the Betta Fish and Future Plans
Finally, the moment arrived to introduce my three betta fish. Each fish was carefully acclimated before being gently placed into their new compartments.

The 20-gallon divider tank, with its new filter, plants, and pebbles, provided a stunning backdrop for my aquatic companions. Their new home was finally ready!
Future plans for the other tanks include a complete overhaul of one, perhaps rehoming the fish to my mother or creating a more impressive setup with larger fish.
Conclusion: A Successful (Mostly) Setup
Setting up the 20-gallon betta fish divider tank was a largely successful endeavor. The new internal filter proved efficient and easy to adjust. The tank dividers, while initially challenging to install, provided ample space for three betta fish.

The tank's aesthetic appeal was significantly enhanced by the simple decorations. While unexpected setbacks occurred (a filter malfunction, the loss of a black shark), the project’s overall outcome was positive.

The addition of live plants is still on the agenda for the future to continue creating a vibrant and healthy environment for the betta fish.
