Сфоткал больную рыбку — узнал диагноз и какое лекарство купить в Lazada с точной дозировкой для твоего аквариума.

Source signals

• SIG-20260426-sea-mainland-hobbyist-utility-th-betta-disease-troubleshoot: «My giant betta suddenly developed something like hard white scales — I've tried medication but it's not improving»
• SIG-20260426-sea-mainland-hobbyist-utility-th-apple-snail-care-protocol: «1) How do I know how much food is right? 2) What's the best calcium supplement?»
• SIG-20260426-sea-mainland-hobbyist-utility-th-arowana-fengshui-pricing: validates premium fish-owner cohort (secondary)

What we ship

**Core features (MVP)**

• Photo symptom checker: photo of sick fish → 3 most likely diagnoses with confidence (ich, fin-rot, popeye, columnaris, swim-bladder, dropsy) + brief Thai explanation
• Dose calculator: "10L tank → 0.5 tsp Methylene Blue → continue 5 days" — accurate to TH-available SKUs (Yamato, Bettafix, Doc Fish)
• LINE reminders: "Day 3/5 of treatment course — add dose"
• Care guide: dropdown by species (betta, apple snail, cherry shrimp) → starter protocol in Thai (water, feed, calcium for snails)
• Lazada/Shopee affiliate links on medications + food + air pumps

**Primary user flow**

1. LINE Login or email signup (free) → input tank volume and species

2. Problem occurs → 1 photo → diagnosis + recommendation in 30 sec

3. Buy medication via affiliate → app generates daily reminders for treatment course

4. After first successful use — paywall: "buy lifetime access for 99 THB"

**What it looks like**

• **Landing**: hero "หมอปลาในมือถือคุณ — ถ่ายรูป รู้ทันที ซื้อยาในเลซาด้า" + before/after-treatment screenshots + Pantip-style testimonials
• **Main app screen**: one big "Photo my fish" camera button + recent diagnosis history
• **Diagnosis result**: 3 candidate conditions with confidence color bars + "buy on Lazada" CTA per medication

**MVP build plan (8 days)**

• Day 1-2: backend (Aquarium/Diagnosis/Treatment models), R2 photo upload
• Day 3-5: vision LLM prompt + 30-symptom training set + dose-calculator logic with TH SKU mapping
• Day 6-7: LINE reminders for treatment course, Lazada affiliate widget
• Day 8: landing (TH-only), deploy + Pantip topic 30609409 reply

Reasoning

SIG-th-betta-disease-troubleshoot and SIG-th-apple-snail-care-protocol show: TH fish-owners post photos to the forum because no local tool exists. Global fishlore apps lack TH localization (medication names Yamato, Bettafix don't match Thai SKUs). Pain is SHARP — sick fish die within days, high urgency. One-time 99 THB pricing fits — "buy when needed" utility purchase, not subscription. Stack is minimal: 8 days to launch. **medium competitive pressure** — Aquarimate and FishLab exist but don't cover TH SKUs and aren't intent-aligned ("my fish is sick" vs "water-parameter monitoring").

Quick competitive read

• **Aquarimate** — water parameters, no visual diagnosis, no TH locale.
• **FishLab** — community Q&A forum, not a tool.
• **PictureThis (plants)** — model we port (visual ID without diagnosis; we add diagnosis).
• **Pantip thread Q&A** — current de-facto channel, slow (days).
• **white space**: TH-localized visual fish-doctor + dose calculator + Lazada SKU. Competitors with traction = 0-1.

Initial pricing hypothesis

Free — 3 photo-diagnostic queries/mo + basic care guide. Premium ONE-TIME 99 THB lifetime = unlimited photo checks + dose calculator + LINE reminders. Alternative — 49 THB/mo (less attractive than lifetime for TH audience). Lazada affiliate 5-10% per medication purchase — foundation for recurring income. 99 THB is ideal for urgency-purchase utility.

Distribution hypothesis

1) Direct Pantip reply on topics 30609409, 39161735 ("built an app, please test"); 2) Facebook groups "กลุ่มคนรักปลากัด", "กลุ่มเลี้ยงกุ้งเชอร์รี่ TH" (10-50K members); 3) ASO in Play Store/App Store with Thai keywords ("ปลาป่วย", "ปลากัดเกล็ดขาว"); 4) TikTok shorts "5 signs your betta is sick" with soft CTA; 5) Partnership with Chatuchak fish vendors — QR posters in pet shops.