lighting for 20 gallon long?

A 4x24W T5 setup should do you very well. Unless you want to put the dollars in to a T5/ LED combo. Either would do well for most reef systems in a smaller tank like that.
 
That T5 fixture should work - I didn't link one because there are literally hundreds to choose from. Just make sure it has good bulbs in it.
 
Im not too experienced with t5 fixtures. Can I put actinic bulbs in a fixture that does not come with them?

Get you a fixture off CL or something and put some nice ATI bulbs in it. I'd go with 2 x Coral Plus and 2 x Blue Plus. If you like more Blue, sub one Coral Plus with AquaBlue Special.
 
Get a quality fixture, they have the best ballasts and reflectors. Aquaticlife & & ati make very good fixtures.

3x blue + & purple plus will get you a very blue looking tank.
 
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