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 reef game with sleek, seamless overflow tech!

DURABLE BUILD - Crafted from high-quality acrylic with reliable foam and nylon components for lasting performance.
COMPACT POWERHOUSE - Optimized for smaller tanks up to 30 gallons, perfect for stylish nano reef enthusiasts.
SECURE ADJUSTABLE - Includes bulkhead and screw fittings for a stable, customizable overflow solution.
TRUSTED BY HOBBYISTS - Proven reliability with zero siphon loss and lifetime durability when properly maintained.
REEF READY TRANSFORMATION - Easily upgrade any standard aquarium into a professional reef setup with a simple hang-on design.

The Seapora Nano Overflow Box is a premium black acrylic overflow system designed to convert standard aquariums up to 30 gallons into reef-ready tanks. Featuring a hang-on-tank design with foam cylinder, nylon tube, screw, and 0.75" bulkhead, it ensures secure, efficient water flow and long-lasting durability favored by nano reef hobbyists.

Specifications

ASIN	B0765BK72W
ASIN	B0765BK72W
Age Range Description	All Life Stages
Best Sellers Rank	#150,297 in Pet Supplies ( See Top 100 in Pet Supplies ) #410 in Aquariums #2,596 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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