so today we noticed that our clam has it's mantle extended. like if there is not enough light in the tank. so my bf took out the screen cover to the tank just to see how much light is it blocking. and low and behold the tank got much brighter when we took out the screen cover. so now my bf wants to take the screen cover off the tank for good. i told him we can't take it out because we have a jawfish and a goby. and i know they are jumpers. i told him we have to expect for it to block some light. but he says it is blocking not some but a alot of light. so now the question is what should we do? as soon as i took out the screen cover the clams mantle went back down. below is a picture of my tank. the left side of the tank has the screen cover on it. and the right side doesn't have the screen cover