Larval tank lighting

HoopsGuru

In Memoriam
What's a typical type of light to go on a larval tank? I have a 15w fluorescent with a 50/50 bulb about 24" above the tank (actually hanging partially of a tank above it so they are getting indirect light. If I move the light on top of the tank, even with layers of paper towel, all the ocellaris larvae move against the outside walls of the tank. I'm getting a bit frustrated as this is about my 6th batch of experimenting just to get them to swim around the tank feeding comfortably. Water flow is from an airstone bubbling enough to keep the top of the water rippling a little bit.
 
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