Aquarium Filter Cube, 4x4x4 Inch Eco-Friendly Water Purifier with Activated Carbon, Ultra-Strong Filtration for Freshwater & Saltwater Fish Tanks, Ponds, Stock Tanks

Within an hour I could see a difference in my tank! This lasts a while, too, just keep up with rinsing it. Great purchase!

This cube has been in our tank a year and a half. We don't have to worry about algae, or cleaning the walls of the tank. Between this cube, our pleco, and our filter system, we don't have a worry in the world. We can leave on the semi for weeks at a time, come home, and the tank is immaculate and clear. We do a half water change and suction the rocks probably every 6ish months. Other than that the tank sustains itself with this. We love it!!

Cube really didn't do much. Certainly didn't work as advertised. Not gonna lie I was skeptical to begin with and should have trusted my gut. Ended up do doing a half tank water change and used algaefix, which started clearing it up within hours and quite thoroughly within 3 days. I used 1 ml for my 36 gallon bow front on the initial treatment when I did the water change, and followed up on day 3 with .5 ml slowly dripped into filter return flow, which did the trick.😊***Take note, I read a lot about the algaefix killing fish due to overdosing, so be mindful and read up about it!!! Stuff works but you have to be proper with it, seriously!!

This is amazing! I’ve heard people say to the contrary, my canister filter works great I don’t have a UV light though and this has done an amazing job cutting algae and making the water sparkle!! If you don’t clean a tank you can expect miracles but Tori well taken care of tank and a good filter it actually made my water sparkle and keeps algae at bay! I highly recommend it and when this one has Ben used up I will definitely purchase again!

It has been in now for two weeks and nothing. Waste of money

Product did arrive damaged on two of the corners. Hopefully it doesn't effect the Product its a bit bigger then a realized it would be but also I didn't read it says to watch it with just water before you put it in tank I'll have to see if anything comes up in a few days that is noticeable. My tank can't be any clearer then it was without it.

This is an incredible product. I have a small aquarium with Beta and was having a terrible time getting the water clean and keeping it clean. I just 3 days I have a sparkling clean aquarium, my fish is much happier and I'm sure healthier. Thank you!

Had to re-order for exchange. Description says notify if broken, it had several chunks out of the edges that weren't visible in the tight shrinkwrap plastic. Exterior packaging intact, missing chunks weren't in wrapper