So on monday i got new glass panels to replace my old acrylic cover tops for my 150 gallon. Ever since then, my cichla have been acting very strange. When i put in their floating food: aro sticks, bio gold +, cichlid gold, fd krill, they usually would all be waiting near the surface and compete for every last piece of food. After i got the new glass tops, they seem scared to go anywhere near the top. They will dart up and grab a piece of food and then quickly dive back down. I have even seen them dart up half way, get spooked and go right back down. Anyone have ideas on what is happening? I also feed them massivore, and they are eating that just fine because it is sinking down to them. I did a 40% WC last night and the parameters are ph 7.8, ammonia 0, nitrite 0, nitrate 30 ppm.