Why not go with the 250 the price difference is next to nothing and if you decide to go bigger you have the light. I went with the ARO ballest for hellolights it will run any bulb se or de american or german! It was 92 on sale
true, i would haev liekd a 250 DE on my tank, lots of light, but beign 15(no job yet) and not wanting to run up my parnts electric bill, i reccommended that!
250W will do well on a 29g. Just figure out how you're going to keep it cool. I had a 400w DE on mine with a 20g refugium tied to it. Never can have too much light.
You can see in my pic above that i have a 7 inch fan in the back of the hood. That thing moves some serious CFM's. I got that as a freebie when i worked at kroger they were replacing all the fans in the freezer section they threw away about 200 of those thing i made out with about 20 of them lol Any way i have it on a temp sensor. If i keep the house ac set on 72 it doesn't kick on but if the house gets above 78 it will kick on and off. That thing can drop the temp of the tank a degree or two in about an hour!!
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