Short answer for an aging sparkling gourami
An aging sparkling gourami commonly eats more cautiously, takes smaller foods, and loses some roundness behind the head and along the belly. This is a tiny, shy labyrinth fish, so appetite change often looks like hesitation rather than refusal: he hovers near cover, watches, and feeds after the first rush is over. Weight change is judged by eye in a sparkling gourami, because the fish is far too small and delicate for routine handling or weighing at home.
Why this gourami eats more slowly with age
A sparkling gourami relies on stealth and cover, picking small items from the surface film, plant leaves, and the water column. As he ages, slower reactions and weaker swimming mean bolder tankmates can clear floating food before he reaches it. His eyesight and aim for tiny moving foods may also be less sharp, so he can strike and miss more often. Resting among leaves between feeds is normal for this species at any age, but an older fish tends to choose one favoured thicket and return to it, travelling less around the tank than he once did.
What healthy slimming looks like in this fish
Gradual slimming in an aging sparkling gourami shows first as a narrower profile just behind the gills and a belly that looks flat rather than gently rounded between meals. The iridescent spangling may look less bright, and the fins may be held a little less widely. He should still brighten when food appears, move to his feeding spot, and eat with interest. A useful check is to view him from above after feeding: a healthy old gourami shows a modest, even fullness, while a worrying one stays pinched on both sides despite having had the chance to eat.
Feeding an older sparkling gourami fairly
Feed an aging sparkling gourami where he actually waits, usually near his plant cover, instead of scattering everything at the open surface. Offer small, slow-sinking or surface-held foods in tiny amounts, and give him a quiet minute before assuming he is not hungry. Keep tankmates that snatch food in mind, because a shy gourami can quietly under-eat in a mixed tank for weeks. Dim, calm feeding conditions help, since this species feeds more confidently when the tank feels sheltered. Note which foods he takes eagerly, because an older fish may keep a strong appetite for one small food while ignoring larger items. Rotating two or three foods he reliably accepts also stops a single missed delivery from becoming a week of poor eating for a fish with little body reserve.
When to get this gourami checked
Contact an aquatic vet if an aging sparkling gourami stops feeding altogether, becomes pinched very quickly, breathes with visible effort at rest, or loses the strength to hold his place among the leaves. Sudden hiding in a fish that normally shows himself at feeding time is also a change worth acting on, especially alongside clamped fins or fading colour over days rather than months. Bring notes on what he still eats and when the change began. Keeping those feeding and body notes in KinsLe's Pet Passport gives this small gourami a record that speaks for him at a veterinary visit.