Hey guys. Need some some quick advice. 240 gal established tank(2 + years) 2 fx5's, ehiem pro 3, 2 AC 110's. 2 spotted gar 6", 2 motoro's 7-8", 2 retic's 5-6". All have been fine and eating great and growing. This morning noticed one of the gar was "bent" like a broken back (still eating though). Then tonight the other gar start shaking uncontrollably all over the tank. Water test great like always. Water change 30% yesterday (weekly always). Rays seem fine and normal. Feeding varied diet of blood worms, mysis, chopped night crawlers, and broke up massivore, 2 x day. Any advice would be awesome. Thnx Matt