Whats better WetDry or Liverock or combo or just charcoal Filters.I have a WETdry built in protein skimmer on Tank 1 with Damsels and clowns.I have had no Fish deaths in a long time at least 5 months.I have thought about adding a 60 G Whisper charcoal Filter on it but not sure when you replace dirty filters does it kill off some good Bacteria?.Dont want to waste money if there is no real benefit in it.On tank 2 with my predator Fish I HAVE TWO 60 G Whisper Filters and have no Fish deaths I change out one Filter evet week there are four filters.On predator tank 3 I have A 75 G WetDry with a built in protein skimmer and a small 15 G charcoal filter.Do you think there be a advantage to putting on a charcoal filter at all.My predator tanks are Fish only not Reef Tanks some base rock in there thats all.Are protein skimmers really any good or a waste of money ?. :wink: