A picture of your tank might help and is it a new tank?
How do I post images?A picture of your tank might help and is it a new tank?
***according to my calc- I have 300 liter- 5*54V= 220V+ the leds, I'm getting close to 1 watt per liter ratio, which is recommended in high tech tank right?Just two T5HO bulbs are enough light for that size planted tank, and two pairs of those bulbs separated so the whole substrate gets good light is also good. Adding a LED light is very much more than you can expect to use without really serious algae problems.
** I have a drop checker which shows greenish-yellowish colour which I assume is enough CO2, maybe too much..You need to verify that you have adequate CO2 in the water for the light you have. You can do this by comparing the pH of a sample of the tank water after a day sitting out in the air, to the pH of the tank water a few hours after the CO2 is turned on. The amount of CO2 in the water will be approximately 3 times 10 raised to the drop in pH power. So, if the pH is 1.0 lower in the tank water, than in the sample of tank water, you have about 3 times 10 to the first power, or 30 ppm of CO2.