This week, we have one Ocean Free Hydra 30 to give away, and all you need to do to be in with a chance of winning it is create or log into your account, and answer the simple question.

The Ocean Free range of filters are the brainchild of Qian Hu, and contain their patented Hydro-Pure technology, which actively detoxifies ammonia and other toxic ions.

The Hydra 30 is suitable for tanks of up to 200 litres capacity, producing a flow of 600lph for just 7.5W of energy uptake.

This competition closes at 9am on Friday December 6, 2019, and is for UK residents only. Good luck!

For the chance to win, create or log into your account, and answer the simple question...