read that the filter system in a planted tank should only circulate half the volume of water in the tank per hour. What is the guide line for this? My 38 gallon has a reverse flow undergravel filter rated at 190 Gal/Hr and also a power filter turned down to lit's lowest flow rate but is rated at 145 Gal/Hr This would be something like 8X the tank volume per hour. I am adding pressurized CO2, have about 18 small fish and a fairly well planted tank. Any suggestions on changing this or is this okay? I am struggling slightly with BGA on the substrate and lower stems of plants, sometimes I wonder if the reverse flow undergravel filter brings out phosphates or waste to the surface of the substrate? This configuration was suggested by my LFS that had nice planted tanks. Question 2: Any advice on the care of Amano shrimp, I will be trying these for the first time.Do folks add algae wafers? Thanks for your help. Randy --- StripMime Report -- processed MIME parts --- multipart/alternative text/plain (text body -- kept) text/html --- ------------------ To unsubscribe from this list, please send mail to majordomo@thekrib.com with "Unsubscribe aga-member" in the body of the message. Archives of this list can be found at http://lists.thekrib.com/aga-member/