DIY Budget-Friendly Beta Tank Divider: Simple & Effective

Updated at: 04/06/2025

Setting up a beta fish tank can be a rewarding experience, but the cost of commercially available dividers can quickly add up. Many bettas thrive in a peaceful, solitary existence, but if you're looking to house multiple bettas – or perhaps separate a breeding pair – a tank divider is essential. Unfortunately, pre-made dividers often carry a hefty price tag, potentially outweighing the initial cost of the tank itself. This is where a DIY approach proves invaluable. Creating your own budget-friendly divider not only saves you money but also allows for customization to fit your specific tank dimensions.

This article will guide you through a simple yet effective method for building your own beta tank divider using readily accessible materials. We'll focus on a straightforward design that prioritizes practicality and affordability, ensuring your betta remains safe and comfortable without breaking the bank. Ready to get started? Let's dive into the step-by-step instructions below.

Preparation and Safety Guidelines

Tools Needed

Sharpie
Sheet of plastic mesh (black preferred)
Report covers
Pair of scissors
Ruler

Safety Guidelines

Always ensure the divider is securely fastened and cannot be easily dislodged by the fish. A poorly secured divider can injure or trap your fish.
Thoroughly clean and cure any new materials (like acrylic or wood) before introducing them to the tank to avoid leaching harmful chemicals into the water.
Monitor fish closely after introducing a divider. Observe for signs of stress, aggression, or injury. Be prepared to remove the divider if necessary.

Step-by-Step Instructions

Measure Tank Dimensions
- Measure your tank's dimensions. Measure the height from under the lip of the tank straight down to the silicone, and then measure the width from lip to lip.
Measure Tank Dimensions
Cut Mesh to Height
- Measure the height of your tank and mark it on the plastic mesh using a pen.
- Cut along the marked line on the mesh to create the divider's height.
Cut Mesh to Height
Cut Mesh to Width
- Measure the width of your tank and mark it on the plastic mesh.
- Cut along the marked line to create the divider's width.
Cut Mesh to Width
Assemble and Adjust Divider
- Slide the cut mesh into the report covers to create a sturdy divider.
- Adjust the divider as needed by trimming the mesh. Add at least two inches of gravel to help keep the divider in place.
Assemble and Adjust Divider

Tips

Use black mesh for better privacy for the bettas.
Use a gold pen if you're using black mesh to make the markings easier to see.
It's okay if the report covers don't go all the way to the top of the divider.

Common Mistakes to Avoid

1. Using unsuitable materials

Reason: Materials like plexiglass that are too brittle or porous can crack, leak, or harbor bacteria, compromising the health of your fish.

Solution: Choose a sturdy, non-porous, and food-safe material like acrylic or a properly sealed piece of sturdy glass.

2. Poor sealant application

Reason: Inadequate sealing can lead to leaks, compromising the water quality in the divided sections of the tank and potentially harming your fish.

Solution: Ensure complete coverage with a high-quality aquarium-safe silicone sealant and allow ample drying time before adding water.

3. Incorrect sizing or placement of the divider

Reason: A poorly sized or placed divider may not fit properly, creating gaps, restricting water flow, or causing stress to the fish.

Solution: Carefully measure your tank and plan the divider's placement to ensure a snug fit and adequate space for your fish in each section.

FAQs

What materials do I need to build a DIY beta tank divider?

Common materials include acrylic sheets (easily cut with a sharp utility knife), silicone sealant (aquarium-safe is crucial!), and a ruler or measuring tape for accurate sizing. You may also need sandpaper for smoothing edges.

How do I ensure my DIY divider is safe for my betta?

Use 100% aquarium-safe silicone sealant to ensure no harmful chemicals leach into the water. Thoroughly cure the sealant according to the manufacturer's instructions before adding water and your betta. Ensure all sharp edges are sanded smooth to prevent injury.

Can I use other materials besides acrylic?

While acrylic is recommended for its clarity and ease of use, you can potentially use other non-porous materials like glass (requires professional cutting) or sturdy, food-safe plastic. Always prioritize aquarium safety and ensure the material is non-toxic and won't leach chemicals into the water.