So every Saturday I do a 25% water change (30 gallons from 120 tank); well today after the change my Kuhli went crazy - 5 of the 6 i have (3 different species) started swimming like crazy up and down. Not for a few minutes - but they have been doing it for 3 hours now. Even the large Pangio Myersi which only comes out once a month joined in the fun. Not sure where number 6 went - maybe back into the cansister filter ? Well if they don't tire themselves out they are going to tire me out - i mean how long can they keep this up. Up and down non-stop. Must really like the change - but they haven't done this any of the previous changes.... maybe water was more dirty this week ?