You may have opinions, I have interpretations. I make my conclusions based on fact. For example, that tank is an unhealthy environment due to a few reasons, the footprint of a 20 gal is much too small for an active 8" arrowana, let alone a 6" pleco, a Senegal bichir and 2 pictus cats. Also the filter looks to be one rated for... A 20g. That filter can barely handle the load of the pleco. Lastly, the poster doesn't mention a heater with his complete set up, can't tell he has one or not from the pic, but I don't believe he does.