01-30-2011, 09:08 PM
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I have been using a Hydro-sponge as a secondary filter in a 60 gal freshwater planted. since I started the sponge three weeks ago, my mollies are happier and flaring more often, my plants are all growing and my algae is all but gone. since the hydrosponge has such a large surface area for microbacteria to grow, it can handle a large amount of waste. the LFS I bought it from uses them almost exclusively for all their freshwater tanks. cheap, easy, and incredible. beware of the cheap ones on Ebay. most of them ship slow boat from china and have larger pores in their sponges greatly reducing their surface area. look for they hydro sponge brand. best $14 I've ever spent on my tanks.