I tried out the $500 Hydro Koralia deal with 2 heads and they sucked. The flow wasn't what they advertise and one of the pumps rattled right off the bat. Called and they said i didn't have a part (which isn't in their product diagrams - said they would send. Don't bother with these - they are el-cheapo and don't point the directions you want to point them in. Also - know that you need special wavemaker type pumps that can take the constant on/off - they have different motors. If you put a standard powerhead on a switch they just burn out quick (within a year - or less)... also - don't think you need the flow you do - most LPS hates it. if you are sps - feel free to blow them our of the water - but make sure your fish don't get sucked in. Even the strongest ones do..
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