alright guys I just added a large piece of driftwood and a lot of lava rocks to their tank in two days ago and they seem to more comfortable now. Also should I keep the temp at 80F?

Just got these guys about three days ago. Can any of you guys tell me how come the L240 having the white colour on his body sometimes and the L129 is still not eating yet? I tried the algae wafer but I never seen the L129 show any interest of it. The L240 is already eating shrimp pellets and sinking ...