I.D. help please

[TMC]

Can someone please tell me what this is the color in the picture isn't very good but in daylight it is beige with a light orange center and in blue light very bright orange center I am new to all this and just moved everything from a 50 gal to a 75 in the other tank these were smaller in diameter but looked healthy since in the new tank (only 2 days) they have more than doubled in size

 

[TMC]

This is what it looks like with blue light again colors aren't real accurate the orange is really bright