Description
Hang on filter 600L/Hr, 6.,5W — Mid-size hang-on-back filter for 60 to 90 cm aquariums
Between a nano filter and a high-flow model there is a large group of tanks, the 60 cm and smaller 90 cm aquariums, that need something in the middle. Hang on filter 600L/Hr, 6.,5W (SKU: SMX550) is a hang-on-back aquarium filter sold under the Absolute label, rated at 600 litres per hour on 6.5 W. It sits on the back rim of the tank, with an intake tube reaching down into the water, and a pump that lifts water into the external filter box, through the media and back over a lip into the tank. The design keeps the display free of filter hardware, keeps the media within easy reach, and adds a ripple to the surface as the water returns.
By the standard guide of four to five turnovers an hour, 600 L/h fits aquariums of around 120 to 150 L, which covers well-stocked 60 cm tanks and lightly stocked 90 cm community setups. The 6.5 W power rating is low enough to run continuously, which is how a filter should operate so the bacteria living in the media stay alive. Before switching on, fill the filter box with water from the tank so the pump primes; running dry can damage it. The intake should sit well below the surface, and the water level should be kept topped up as it evaporates. Clean the media by squeezing it in a bucket of removed tank water during the regular water change, and replace mechanical sponges only when they begin to break down, a piece at a time. Small fish and shrimp can be drawn into the intake, so a sponge prefilter over the intake tube is a sensible addition in tanks with fry or shrimp.
Usage & Application
When to Use
- 60 to 90 cm tanks: Aquariums of about 120 to 150 L.
- Community fish: Tetras, livebearers, corydoras and similar stockings.
- Space-conscious setups: Keeping the filter outside the display.
- Second filter: Adding flow and media to a tank with an existing filter.
Installation & Setup Guide
- Fit to the back rim: Hang the filter level with the intake well under the surface.
- Prime with tank water: Fill the box before plugging in.
- Top up regularly: Keep the water level high so the return runs quietly.
- Gentle cleaning: Squeeze media in old tank water to keep the bacteria alive.
Product Specifications & Highlights
Key Features
- Rated 600 L/h: Mid-range flow for medium tanks.
- 6.5 W: Low draw for day-and-night running.
- Hang-on-back mounting: No hoses and no cabinet space needed.
- Accessible media: Lift the media out from above for maintenance.
- Surface movement: Return flow helps gas exchange.
Product Details
- Brand: Absolute (Australia)
- SKU: SMX550
- Product Type: Filters > Hang-On-Back Filter
- Flow Rate: 600 L/h (rated)
- Power: 6.5 W
- Suggested Aquarium Size: About 120–150 L at four to five turnovers per hour
- Mounting: Hangs on the back rim of the aquarium
- Target Environment: Freshwater community aquariums









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