Iv'e actually got two strange things going on in my 29 gal tank ,yesterday I noticed my 6" red cap Oranda on the bottom of the tank ,went I went closer she immediatly went to the top of the tank (as if expecting food).I've noticed this fish is very active at night ,she appears to be sleeping in the day lately.The other thing I noticed is tonight my 5" Ryukin is swimming very,very fast ,erratictly and then flipped upside down(at the top of the tank) and stayed like that a few seconds.I opened the tank ,touched him,he flipped rightways and then began his erratic wierd swimming again.My parameters in this tank are all fine ,could this be swim bladder disease and what can I do?