any help is appreciated. I have had an established aquarium with one electric blue african ciclid for over a year. a few weeks ago i added another and things were going good so i bought another (orange african ciclid). it did not fair well against the others and was huddeling a lot. 2 days later my original blue and my new orange were found dead. the next day the new blue was also dead. today i was doing a water change and planning on getting 2 oscars and start over then i saw THEM! small brown/black worms were in the water moving and on the glass. about 6 or so were in the water change waste water bucket when i dumped it out. i tried to google these critters but not finding much luck. i have never fed live only ciclid flakes. i don't think they are planaria as they are not white. did these worms kill my fish? are they harmful or just coincidental? i'm including a photo. i have not done a water change in quite some time 6 mo. or so. I feel terrible. i'm sure this probably could of been avoided and don't want it happening again. i am scared to put any fish into my tank now. sorry about the rambling. i guess i am looking for any info. please help. thanks, JASON.