Interesting Development! The other night i was working about 10 feet from my tank it was after midnight and the lights were off in the tank and subdued in the room. I hear quite the splash and heard a rattle on the hood of my tank. I was like what the hell was that, looked over at my tank and all seemed normal in the low light.... Then again this morning before the lights were on I definetley heard the same noises. I am now thinking that the marks and scrapes are more likely wounds on my Gourami from jumping up into the hood! I have 3 Praecox Rainbow ( 1 female - 2" and 2-1" M/F), about 12 orange platies ( some are just small fry ) and 2 cardinal tetras and 6 ottos. it is a 30 gal tank that is very planted, with lots of hiding space. The gourami is a 3" Female. I would think only the rainbow would be doing anything, but I've had them in combo for years. The Gourami is fairly new to the tank 6months and was having problems with 2 territorial silver tip tetras... they went to the LFS for trade.
Is this common. During the day the gourami does not seem at all fazed by the other fish, will come to the glass to meet me and wag back and forth, she eats well and does not ever seemed bothered by the other fish, the rainbows tend to hang at the lower part of the farside of the tank from Gouramies world.
very weird IMO.
Thoughts.