What size gap do i need behind the tank with this filter ?

Hanging on the side could be an option if there isn’t much room at the back.

Would this be too much flow for a 50L beta tank?

Yes it will work fine. I have mine on my 30cm cube 27 litre Beta tank. It hangs on the back perfectly, I have corse, medium, fine sponges in the bottom tay. Then Seachem Matrix, Seachem Purigen 100g and lastly Filter wool. I use the spray bar attachment facing forwards at 45 degrees towards the water surface and the inlet open fully to draw water from the tank and the outlet at minimum to reduce the flow. My Betta makes use of the whole water column with ease. The water stays crystal clear and the parameters are all stable. I haven't suffered any spikes or crashes.

What's the wattage please?

This pump is 6W. I bought one for my Axolotl tank and was so impressed I bought one for each of my other 3 tanks.

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allpondsolutions HOB-500 Aquarium External Fish Tank Water Filter for Coldwater, Tropical or Marine Aquariums, for Tanks Up to 250 Litres – Includes Filter Foams, hose and Spray Bar - Full Kit

Product ID: 102459792

💧500 L/H flow rate

📏Fits tanks up to 250L

🧰Complete kit with foams & spray bar

₨1952

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Description

🐠 Elevate your aquarium game with effortless clarity and style!

POWERFUL 500 L H FLOW - Optimized water circulation for crystal-clear tanks
ADJUSTABLE FLOW CONTROL - Customize water flow to suit your tank’s unique needs
ALL INCLUSIVE FILTER KIT - Comes with filter foams, hose, and spray bar for instant setup
VERSATILE FOR ALL AQUARIUMS - Perfect for coldwater, tropical, or marine setups up to 250L
SPACE SAVING EXTERNAL DESIGN - Hangs outside your aquarium, freeing up precious tank space

The allpondsolutions HOB-500 is a high-performance external hang-on-back filter delivering 500 liters per hour, designed for aquariums up to 250 liters. Its space-saving design keeps your tank clutter-free while providing adjustable flow control. This full kit includes essential filter foams, hose, and spray bar, making it ideal for coldwater, tropical, and marine fish tanks.

Specifications

ASIN	B07M851PX5
Batteries Included	No
Batteries required	No
Best Sellers Rank	15,348 in Pet Supplies ( See Top 100 in Pet Supplies ) 64 in Aquarium Filters
Customer Reviews	4.1 4.1 out of 5 stars (541)
Date First Available	14 Jan. 2019
Item Weight	1.65 kg
Item model number	HOB-500
Number of Items	1
Pet Type	Fish
Product Dimensions	30 x 20 x 14 cm; 1.65 kg
Quantity	1
Size	1.65 kg (Pack of 1)

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₨1952

Duties & taxes included

In stock

Sold byAmazon SeychellesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Seychelles.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

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Customer service was outstanding when I had questions about the product.

2 days ago

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