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Most plain form hydrometers are calibrated at 60F. As water temp rises/falls the calibration temp, your salinity readings will be slightly altered. For example, if your measured SG @ 68F(20C) was 1.000 then the actual SG @68F is 1.000 + 0.0007 = 1.0007, at 77F it is 1.0000 + 0.0018 = 1.0018...

kipass......what are the advantages of the Iwaki over a pump like a little giant.....noise primarily?

thanks to both of you. Ordered the true 03 actinics. WIll hold onto and use the whites until I need to replace. Thanks again

never mind......if I read the rest of your post carefully I would have answered my own question. Thanks again

Yup....didn't like what a read...but a very helpful post. Thanks to both you and bang BTW...should I also upgrade my 6600Ks to 10000k's??

In addition to the silicon, don't forget to use plumber's wrap/tape on the joints (thin white tape you wrap around the treads of the bulkhead screws) -- makes a tighter connection

I'm running a Custom Sea Life fixture for my 155. It has 2 x 96 watt Act. Blues and 4 x 96 watt full spectrum 6600K. Question: should I have gotten the 8800K or 10,00K bulbs instead? If so, why? What will I be limited to with only the 6600Ks as oppoesed to the 10,000k's Thanks Jim