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So, after a while of deciding on whether to purchase a Finnex planted + light fixture for my 20 gallon long (Precisely 30in x 13in x 13in I believe), and was recently bestowed upon flood lighting fixtures! These light fixtures are quite cheap, having 6500k+ etc. I plan on getting two of them and and laying them on top of a glass canopy. Any opinions or things I should know aboout these lght fixtures before I purchase?

PS, I plan to have some plants, especially a dwarf hairgrass carpet, and maybe some java ferns and moss balls
 

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They should work for a 20 long. It may give a little too much light if anything. If you find it starts to cause algae you can just raise it up some. There are several LED spotlight builds on Youtube. I believe I saw some on here as well. You might want to do a search using the words LED and spotlight.
 
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