Shentake,
Grindal worms are high in protein and fat; good as a supplement for conditioning but not good if it's the only food you feed. Like humans, fishes will also be healthy if they have a varied diet. As I've said elsewhere, tubifex isn't all that bad if you clean and purge it well.
If space allows, why not venture into daphnia/moina culturing or vermicomposting?
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