02-05-2009, 12:00 PM
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Every tank will evap a different amount of water. Lights, flow, ambient temp, tank temp all play factors. I lose about a gallon a day in my 55g (it's a bit less then that) so i'd imagine in your 180 +30g you'll probably lose 3g to say the least. You can pour the water into the sump every day and make sure you have a lineto where you always want the water to stay. Do this to keep the SG from getting all kinds of jacked up. Also, in the sump, you want to leave space for water in case you have to turn off the pumps. Do a test run. Turn off the return pumps and make sure that in the off position you dont over flow the sump. You do this because if, and when the power goes out, it doesn't cause a flood and get all your carpet/tile/wood floor all wet.
There's another thing you can do. which is the preferance to many hobbiest and that's Auto-Topoffs. They are wonderful gadgets that top the water off for you, as long as you have the water resevior full. You can look at many of them here
. it's a very well known company that has a great reputation. If you can DIY you'll save yourself a ton of money in the hobby, but if not there are instructions on how to put this together, and reading this now will make no sense, but later it will, get a top-off with double float switches for added ensurance.