does anybody have any (good or bad) experience with any of these, like "Kent Nitrate Sponge" or any of those? I have a 54 gallon tank with a wet/dry trickle filter and my ammonia and nitrites are always near or at zero but my nitrates are sky high...it's a FO tank and it doesn't seem to bother them at all but I thought if it would help I might pick up one of these...
thanx,
shep