Worms are to addictive I have had rays feeding on pellets stop feeding on pellets for 2 weeks after a feed of worms
If you want to feed spiralina then get some meal worms feed them on spiralina flake the feed the worms to the rays I feed my meal worms spiralina and apple the rays love them but are only lucky if they get 2 per week as they are just for my aro but the rays fight for any the aro misses
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Noticed not many use NLS... is it not readily accepted by most rays that are pellet trained?
I don't think you can ever go wrong with NLS