The Aquatic Centre on Facebook: https://bit.ly/2BWyqh3 Ciano CF Stone 80 (Ebay UK / EU): https://ebay.to/2ECtXBC Ciano CF Stone 80 (Amazon): https://geni.us/PKj2hI Foams and Biohome Ultimate: http://www.filterpro.co.uk (FilterPro site has links to suppliers in other countries) Thanks to Gary from The Aquatic Centre at South Shields for sending me this unusual filter to take a look at in the Pimp My Filter video series. Keep an eye out for a give away video featuring this filter. This is certainly one of the more unusual aquarium filters I have looked at in this series but if you're prepared to get the super glue out it could be one of the best looking - just imagine it covered in coarse sand and / or Java moss.... Although the concept of the filter is good the stock filter media and foams don't really make best use of the space so I managed to get 555g of Biogravel in there as well as graded foams which makes it suitable for a tank of around 50 litres to 60 litres (13 - 16 US gallons) if you want to achieve a full nitrogen cycle. Like most cartridge based systems the cost of 'official' parts is crazy and a cheap upgrade can easily make the filter more effective as shown in this video. WHAT IS A FULL CYCLE? *If someone tells you the aquarium nitrogen cycle ends with the production of nitrate that is incorrect - please read on* A full cycle is completed by bacteria - the aerobic part of biological filtration which processes ammonia to nitrite and nitrite to nitrate followed by an anaerobic part which processes nitrate into soluble nitrogen which bubbles off to the atmosphere. Therefore it requires a suitable amount of excellent quality filter media to be able to provide the environment for both aerobic AND anaerobic bacteria - that is what Biohome ultimate does perfectly but even with such good media there are limitations and we recommend the following amounts for different stocking scenarios: (1 US gallon = 3.8 litres) (1kg = 2.2 lbs) Average community tropical aquarium = 1kg per 100 litres Average coldwater aquarium = 1kg - 1.5kg per 100 litres Predator aquarium = 1.5kg - 2kg per 100 litres Large cichlid aquarium = 1.5kg - 2kg per 100 litres Malawi / Tanganyikan aquarium = 1.5kg - 2kg per 100 litres Marine aquarium = 1.5kg - 2kg per 100 litres Average mixed fish pond = 1kg per 200 litres Average koi pond = 1kg per 150 litres You may be disagreeing with the above figures but remember that they are for a FULL CYCLE not half a job - achieving 0 ammonia and 0 nitrite is quite easy since aerobic bacteria grows freely on any surface but the anaerobic bacteria responsible for COMPLETING the cycle needs more a specialized habitat. Size a filter properly, set it up sensibly and you will have perfect water - it's that simple....and your filter won't be t ... https://www.youtube.com/watch?v=mehSJrIfj1o