Are you facing aggressive fish behavior in your community tank? A stressed-out fish can quickly become a major problem. Expensive store-bought dividers may seem like the only solution, but what if there was a cheaper, simpler alternative? This DIY aquarium divider guide will show you how to create a custom, budget-friendly solution using readily available materials. We'll take you step-by-step through the process, from measuring and cutting to assembly and installation. This project is perfect for aquarists looking for a practical and cost-effective way to separate their fish while maintaining a healthy tank environment. Get ready to save money and keep your finned friends happy!This guide demonstrates how to build a reliable divider for your aquarium using PVC piping, egg crate, and zip ties. We’ll cover essential measurements to ensure a perfect fit in your tank and provide tips for creating a sturdy frame. Learn how to add a convenient small door for controlled interaction between your fish, adding flexibility to the design. The entire project is surprisingly inexpensive, proving that effective aquarium solutions don't have to break the bank. Prepare to tackle this easy-to-follow guide and create a custom divider tailored to your tank’s specific needs.
Read more: Fish Tank Dividers: A Comprehensive Review of Types and Uses
The Problem: Aggressive Male Geo
My male Geo was aggressively harassing the female, causing her significant stress. This necessitated immediate separation to ensure her well-being. A temporary solution was needed, prompting the creation of a DIY aquarium divider.

I moved the stressed female Geo to a smaller tank in my kitchen. This temporary setup, however, had less-than-ideal lighting conditions due to kitchen glare.

The need for a quick, cost-effective solution led to the exploration of building a custom divider for my main 75-gallon tank.
Materials and Costs: Keeping it Affordable
The materials were surprisingly inexpensive, taking advantage of readily available items. I used zip ties (free from work), three-way half-inch PVC connections (approximately $2.40 total), and a sheet of egg crate (around $12).

Approximately 10 feet of half-inch PVC piping cost around a dollar, showcasing the project's budget-friendly nature. This cost-effectiveness is a major advantage of this DIY approach.

The total cost was minimal, making this a great option for aquarists on a budget. The project proves that high-quality solutions aren't always expensive.

Construction and Measurement: Trial and Error
Measuring accurately was crucial for the divider's fit. I measured the tank's interior dimensions, compensating for the PVC's thickness. Several attempts were made to achieve the correct sizing.

The three-way PVC connections were strategically used to create a sturdy frame and prevent tilting. Braces across the top and bottom provide stability.

The process involved cutting the PVC to size, assembling the frame, and then attaching the egg crate using zip ties. This required patience and attention to detail.

Egg Crate and Zip Ties: Securing the Divider
The egg crate provided a porous barrier, allowing water flow while preventing fish from passing. However, its large holes make it unsuitable for smaller fish species.

Zip ties were used to securely attach the egg crate to the PVC frame. Careful tension was necessary to avoid breakage of the relatively fragile egg crate.

The process involved cutting and attaching the egg crate, ensuring a snug but not overly tight fit. Trimming excess materials created a clean, finished product.
Adding a Door: Functionality and Refinement
A small door was added to the divider to provide access and allow temporary interaction between the fish. This added functionality enhances the divider's versatility.

This small door was created by cutting a hole and attaching a slightly larger piece of egg crate. Simple zip ties secured the makeshift door.
The door allows for controlled interaction when needed, ensuring the female Geo can have access to additional space and potential interaction while maintaining separation.
Installation and Final Thoughts
Installing the divider in the established tank was challenging due to the substrate. An empty tank would have made this step significantly easier.

The divider provided secure separation, and the addition of the door enhances its overall practicality and flexibility.

Overall, this DIY project provides a cost-effective solution for separating fish within a tank. It’s easy to implement with readily available materials and modifications can be easily applied.