AR850 is 82x44x58cm, 155 Litres right?
the lighting looks a bit dim
try to aim for at the very least 1watt per 2 litres which would properly be all the tubes. if all the tubes are standard then one of the tubes would be around 14000K, a blue/purple color which is useless for growing plants.
whats the other two tubes? and how old are they?. good lighting is a must for growing plants with out it everything else u do is just a waste of time.