In my experience tigers dont hold weight very long, they seem to burn through food rapidly ... your little guy does look thin, but then again most small fish are thin, so i wouldnt be too concerned ... if he starts behaving oddly, flashing, breathing heavy, develops any sort of spots or anything on his body, or his fins start cracking then i'd be concerned about disease, otherwise i'd say its the nature of the beast ... they start thickening up more and more as they grow larger
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