At this time of year, algal blooms and/or a slightly murky appearance is not unusual. The water is warming up, presumably you are feeding and consequently the additional nutrients in the water coupled with the rising temperatures often result in a slight algal bloom. Mid summer, the water is often slightly murky which is a good sign in fact.
Make sure your UV bulbs are OK but I think you should find that clarity will return, given time. See how things stand in a couple of weeks.
Alan
Posted on Apr 29, 2005, 9:00 PM from IP address 213.120.101.21