do you have holes in the bottom to let the water flow out if so maybe need more or bigger holes?

did you mix any perlite?

try those things if you have not already done so
HapaPride Reviewed by HapaPride on . Slow growth Hi All, I have a seedling that's been up about 1.5 weeks. It is less than 1/2" high, and has tiny leaves. Any idea what is causing this slow growth? I realize that maybe it's just working on building a root system, but it just seems like it should have grown some by now. I have a 400W MH lamp 32" above. Opinions appreciated! Rating: 5