I have a flowerhorn, dovii festae, red devil and male convict. Wiping the glass makes it seem like there is no fish in my tank. I had the tank set out next to a door that was always open and a frequent walkway. It was a bad move as we must look massive from inside the tank and move quickly when walking going about your thing. I moved it a further away from the original spot and good as gold. They now come front for greetings and to see who's watching who. Give it a couple days to settle in. I put them into a 8ft tank and they acted like I dropped them centre of a lake for feeding haha