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You have medium light tank I was 'guesstimating' last night with my reply :wink: The size of the tank is 350l tank so on a basic metric 350l = 92 US gallons approx, so 146 watts divided by 92 gallons = 1.6 watts per gallon approx so you have a medium light tank by that measurement...

A 5 hour light period is really too little, this is only a low medium light tank so 8 hours minimum. Download Chuck's Planted Aquarium Calculator and work out the dosages for your size tank, just punch the numbers into the calculator. You might get away with half EI dosage for a low light tank...

You are dosing 14.4ppm nitrate per 40ml solution and 3.6ppm phosphate per 40ml dose, so you are probably overdoing it especially with the PO4. Nitrate dosage is probably ok if a bit on the high side but the PO4 dosage is high, I usually aim for 3-4 ppm per week with EI method. Cant comment on...

Interesting alright although it does not give any reference to where the article was originally published other than the year 1923.

Tom Im running a 150L lowtech tank atm with one just 55W PC bulb, I would say this is just about adequate. Personally I would opt for the 2x36w version and run both lights on your 180L With the interpet convertagear you have to run both lamps AFAIK, running 2x55W would be too much IMHO, and...