u/Few-Inspection464

i have had two GALs since august, when i got them they were 5-7cm long. one has tripled his weight, putting on like 60g since then but the other has only put on like 15g and has lost weight recently. they both have the same conditions but the smaller one (pictured here) was a lot less active in winter so that could be why? also the smaller one is the egg layer though hasn't laid any in the past couple months.

the past few days ive been trying him on different foods and to see what he likes the most? i have protein powder for them as well but he's quite picky. ive tried him on mushrooms today and he's genuinely sat staring at them for the past three hours.

does anyone have any tips that might help? should i be concerned about him?