"Medium Fluval Breeder Box" Upgrade Kit | Stainless Steel 30-Mesh Exit Grate | Prefilter Sponge

Upgrade your MEDIUM Fluval Breeder Box for better flow, safer fry, and precision‑level performance.

Looking to get more out of your MEDIUM Fluval Breeder Box? The BST3D Upgrade Kit transforms the stock breeder box into a high‑performance system ideal for serious hobbyists and fish breeders. Improve water flow, increase fry safety, and boost overall reliability with precision‑designed 3D‑printed components and premium materials.

What’s in the Kit:

1 x High‑Flow Drop‑In Exit Grate Bracket (Custom Design M)

1 x Plastic Teeth Exit Grate (1mm slits)

1 x Stainless Steel 30‑Mesh Exit Grate (0.6mm holes)

1 x Uplift Tube Intake + Custom Adapter

1 x Black Prefilter Sponge

1 x Breeder Box Leveler + 2 x Stand‑Off Feet

   Detailed What’s Included in the BST3D Upgrade Kit

High‑Flow Drop‑In Exit Grate Bracket (Custom Design)

• Over 3× the surface area of the stock exit
• Significantly improves water movement and reduces clogging
• Compatible with additional BST3D custom grate inserts
• Custom‑fit exclusively for the MEDIUM Fluval Breeder Box

Plastic Teeth Exit Grate

• Precision‑cut with 27 slits (1 mm × 21 mm)
• Excellent flow while keeping fry safely inside the box

Upgraded 304 Stainless Steel 30‑Mesh Exit Grate

• Corrosion‑resistant 304 stainless steel
• 0.6 mm holes for maximum fry protection
• Provides smooth, consistent flow and long‑term durability

Uplift Tube Intake + Custom Adapter

• Fits the stock Fluval uplift tube perfectly
• Includes a secure airline connection point
• Offers an increased intake surface area over the stock parts
• Improves flow stability and reduces clogging

Black Prefilter Sponge (1 included)

• Custom‑fit for the intake tube
• Blocks debris before it enters the breeder box
• Extends time between cleanings and maintains steady flow

One Breeder Box Leveler + Two Stand‑Off Feet

• Keeps your breeder box perfectly level
• Ideal when positioning the box slightly away from the tank wall
• Makes adding/removing fry and cleaning significantly easier

   NOT INCLUDED

• Medium Fluval Breeder Box
• Aquarium air pump
• Adhesive Recommended Adhesives for Attaching Leveler and Stand-off Feet:
  
• KrazyProtz 3D Printer Superglue Gel
• Gorilla Polyurethane glue
• Eggs, fry, or small fish you’re raising   ;)

Care Instructions for 3D‑Printed Parts

Rinse your parts with room‑temperature tap water, then air‑dry or gently towel‑dry. To keep them in top condition, avoid dishwashers, high heat, or prolonged direct sunlight. (especially temperatures above 110°F)

Notice: This item is an aftermarket component designed by BST 3D Printing to be compatible with certain setups. We are not affiliated with, associated with, or sponsored by Fluval. All brand names and trademarks belong to their respective owners.