how does it restart after siphon break due to power outage

It should not break the siphon when the power goes out. The water level on both sides of the overflow pipe will remain submerged when the water stops flowing, preventing any air to get into the tube, causing the siphon break. When the power comes on, the system will automatically restart when the water level in the tank exceeds the height of overflow container in the tank. I've had several outages that did not result in any overflow of the tank. However, I have had air get into the overflow tube and restrict the amount of water that can move through the pipe causing the tank to overflow. This was caused by biological growth in the tank side causing air to be pulled into the water, causing air to accumulate in the overflow pipe. Regular maintenance will prevent this from happening.

What is the measurement on the outside of the overflow? Widest point from glass to backside of overflow?

From the outside of my aquarium to the outside edge of the overflow device is 3.25"

What's the flow rate for this what size return pump would you need?

The flow is rated at like 200 gallon per hour. I do have mine set up on a pump that pushes 400 minus some loss for elbow joints and head height.

do you have to drill a hole in the tank

No holes to drill. Hangs over top of tank.

Seapora Nano Overflow Box Black

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Description

🖤 Elevate your nano tank game — sleek, smart, and reef-ready!

REEF READY UPGRADE - Transform any standard aquarium into a professional reef tank with ease.
COMPACT EFFICIENT - Designed specifically for smaller tanks up to 30 gallons, maximizing space and performance.
LIFETIME PERFORMANCE - Engineered to maintain siphon reliability and withstand daily use without fail.
DURABLE ACRYLIC BUILD - Premium black acrylic ensures long-lasting durability and a modern aesthetic.
SECURE HANG ON DESIGN - Easily mounts on your tank with included hardware for stable, maintenance-friendly operation.

The Seapora Nano Overflow Box is a compact, black acrylic overflow solution designed for aquariums up to 30 gallons. Featuring a hang-on-tank design with included foam cylinder, nylon tube, screw, and 0.75" bulkhead, it effortlessly converts standard tanks into reef-ready setups. Built for durability and reliable siphon performance, this overflow box is a must-have upgrade for nano reef enthusiasts seeking a sleek, efficient filtration enhancement.

Specifications

ASIN	B0765BK72W
ASIN	B0765BK72W
Age Range Description	All Life Stages
Best Sellers Rank	#116,571 in Pet Supplies ( See Top 100 in Pet Supplies ) #293 in Aquariums #1,916 in Aquarium Filter Accessories
Brand Name	Seapora
Color	Black
Customer Reviews	4.0 4.0 out of 5 stars (88)
Date First Available	September 25, 2017
Date First Available	September 25, 2017
Directions	Use as directed on packaging
Included Components	Seapora Nano Overflow Box
Item Dimensions LxWxH	5.25 x 6.3 x 8.5 inches
Item Package Dimensions L x W x H	10.98 x 9.29 x 5.24 inches
Item Weight	1.79 pounds
Item model number	87000
Item model number	87000
Manufacturer	Seapora
Manufacturer	Seapora
Material	Acrylic
Model Name	Seapora Nano Overflow Box
Number of Items	1
Product Dimensions	5.25 x 6.3 x 8.5 inches; 1.79 Pounds
Size	1 Count (Pack of 1)
Specific Uses for Product	Indoor
Style	Modern
Target Audience Keyword	fish
Warranty Description	Manufacturer Warranty

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Seapora Nano Overflow Box,Black

Description

Specifications

Common Questions