Hello everyone,
This christmass, whay not give a try to the incredible Haitt filtration system that eliminate No3, Po4 from your tank. To make it really easy, we make you some complete kit for tanks up to 25 gallon here:
eBay Store: Search results for right now bacteria.
All you need is to place the carbon in a canister and add the bacteria. For my 15 gallon, I use a fluval filter. for smaller tank, you could also use an aquaclear filter or any other small filter. Results are incredible. Note that you can simply put the carbon in a sump but testing have showed that results are not as great.
Just as an example, we have installed this carbon system on an 80 gallon (fish only) couple weeks ago. That tank was a real mess: super high nitrate (over 50ppm!!!) and high phosphate. Yesterday, No3 level was 2.5ppm and my salifert test did not found any trace of Po4 (all this without water chante!!) In any good setup, this system will keep No3 and Po4 at close to zero at all time!
And the best is that this system will not need to be replace before an other 4 years! I suggest to add some more bacteria every few month but you could do without that. Just keep doing your monthly water changes and rinse the carbon every month.