Cycling a 250L aquarium.

Hi Ledo, first off, welcome to apc. What is the water volume of your tank? With 210W of useable lighting, I hope you're at least around 70 gallons.

A couple of points. If you start out with a heavily planted tank, you don't need to worry about cycling. The plants will quickly take up any ammonia which may form. Your tank is not heavily planted. If you can, try to put in quite a few more fast growing stem plants. Look at the plantfinder here on apc for info on some fast growers.

I don't see any mention of fertilization. With high lighting, you will most definitely need to do that. Two common ways are via EI (estimative index) or PPS (perpetual preservation system). Info on both can be found in the fert forum here.

Hi Bert

Bert H said:

What is the water volume of your tank?

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Around 65 gallons.

Bert H said:

Your tank is not heavily planted.

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That pic is the first day of plants. I hope that it will grow up.

Bert H said:

I don't see any mention of fertilization.

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Mmmm. Do you think that I should start fertilization right now? Interesting...

Thanks for help

Ledo

Plants need nutrients to grow, even from the start, though you might not dose full strength at the very start. Here's some reading which might help you in general knowledge:
http://www.rexgrigg.com/
http://www.aquatic-plants.org/articles/basics/pages/index.html
http://www.aquaticplantcentral.com/...ums/14684-new-tank-setup-guide-parts-1-a.html

You also need to keep the concentration of CO2 in the water near 30 ppm to help avoid algae and provide the carbon the plants need to grow. The best way to be sure you are doing this is to use a drop checker as described in http://www.aquaticplantcentral.com/...aquarium-projects/32100-diy-drop-checker.html