HOCTRAKA Aquarium Sponges Submersible Salt Water Review

[7 Layer Design] -- 7-layer ribbing shape sponge aquarium filter combines bio-filtration, oxygenation and physical filtration in one and also makes small water flow, which can ensure the excellence of the water quality. It is great for fry aquariums and brine shrimp hatcheries because it can prevent young fry from being trapped in the filter media.Helps your small fish or shrimp to live a happy, healthy life. [Easy to use] -- all the parts of this filter are detachable, you can easily to assemble them together, with 2 strong suction cups you can stick the filter firmly to any tank position under water, withouting floating. The water outlet pipe can be extended and rotated, we can change direction of water flow by rotating the outlet port or adjusting it above or below the waterline. [Removable Fine Sponges] -- you can easy to take down the 2 sponges from the filter to clean or replace it, the 2 sponges are fine 60ppi not coarse, which means more surface area for beneficial bacteri to live on. Don't use tap water to clean it, just rinse or squeeze the sponges by using the aquarium water.And we suggest you change the sponge and the filter media every 3 months, you do not need to buy a new filter, just replace the refillable filter media. [Package Includes] -- 1 double sponge filter with 2 containers +1 bag of ceramic media balls + 2 pare sponges(packed in the 2 containers). This aquarium filter must be used with an air pupm and a standard size 4mm air hose, please note pump and air hose are not included. Please choose a powerful enough air pump according to your fish tank size for this filter. [Filter Demension] -- plus the sponge filter with media balls takes up no more room. HOCTRAKA filter is 5.5" in width and 9" to 13" in height, suggest for 15 to 55 gallon fish tank. For larger tank you may need 2 of this filter. Note: When using it for the first time, squeeze the sponge into the water tank for 5 to 10 times. Do not rinse the sponge with a tap or hot water.