Seedlings aren't thriving - why?

[OzPhal]

Hi Everybody,

I have some phal seedlings growing in a semi-hydroponic setup. I'm using perlite as the medium - a small fish tank as the reservoir. The lid is on the fish tank. There are holes in the side of the pots and about an inch of water in the bottom - to this i add Growth Technology Orchid Focus which has the following constituents (%w/v):

Nitrogen 1.29%
Phosphorous 0.31%
Potassium 1.01%
Calcium 1.00%
Magnesium 0.40%
Sulfate 0.15%
Iron 0.031%
Manganese 0.0095%
Boron 0.0021%
Zinc 0.0020%
Copper 0.0010%
Molybdenum 0.0005%

Humidity is around 75% with temperatures between 20 - 28oC. The unit sits in front of a south facing window (i'm in the southern hemisphere) and there is a small fan in there running on a continuous basis for air movement. I add fertiliser every few weeks (about 7ml per litre) and the reservoir holds about 4 litres...

Why are my little ladies not thriving? I've had them since i deflasked them in may last year... they have put out a few new leaves but that's about it... I have a phal bellina in there that just seems to have gone dormant

Any advice you could offer would be appreciated

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