Yeah, we unfortunately have the overflow plant tank...the problem with using that blasted thing for plants is that there's too much of an O2/CO2 exhange at the surface, due to all the agitation that overflow systems cause. Cleaning it is a pain, too. You can gravel-vac the deeper partitions no problem, but when you get down to the one that's only 6" deep....well, it gets to be a little difficult to get it all clean before you run out of water.
As for the red algae...yes, it's a problem in my store, too, although not as bad as I've seen it in other stores. Unfortunately, most Petco's are dealing with a severe phosphate problem in their supply water. The tank systems they use don't create enough water flow, either. And, to top it all off, they're using the MARS systems built by Marineland. They have a huge bio-wheel on them, which is good for freshwater, but it just becomes a huge nitrate factory in saltwater. There are just too many things for a place as busy during the day as Petco to deal with...I know that firsthand. You try and get all you can done in the time you're allowed, but you can only get so much done. :wink:
-Flame