This thread got a good amount of views but no replies, so, I thought I'd give my personal review of the Seachem Tidal 110 after about 2 months of use.
As I stated above, I'm a longtime user and fan of Aquaclears, I'm also naturally a skeptic....so all of the hype that came with the Tidal filters had me weary.
Down to the nitty-gritty, I basically had 2 tanks setup with similar bio-loads, 1 tank with an Aquaclear 110 and 1 tank with the Tidal 110 (Neither were Discus setups). So, if you don't already know, the Tidal has 3 water inlets, vs the 1 inlet on the Aqualcear....this is good and bad. It will pull water from 3 different areas of the water column, however, if you are like me and tend to use a pre-filter sponge..this complicates things. I found it necessary to have a pre-filter on the inlet tube, as well as one around the skimmer, I attached the one on the skimmer with fishing line. However, this leaves the middle inlet open, and I haven't found a good way to attach a pre-filter to it....so if you are feeding worms of any kind, they will get into the filter and you will have to clear it more frequently.
Basically, if you have a tank where you are feeding mostly floating pellets or sinking, this filter is very very good and I recommend it (As long as you have a prefilter on the skimmer). I see a very big difference in water clarity in my Tidal tank compared to my Aquaclear tank. If you have a tank where you are feeding a lot of worms, FDBW or bloodworms, or even a beefheart mix that tend to dissolve...I would stick to the Aquaclear. All in all, if you are a discus keeper and you have been using Aquaclears, I would stick to them...just my 2cents.
Cheers!