Im one those people who *really* hate beefheart and would never use it...
My discus loved:
DRY:
JBL Novo/Grano Discus
Tetra Prima
Tetra Pro Colour Crisps
Tetra Pro Vegetable Crisps
JBL Spirulina
New Life Spectrum Pellets (if you can get hold of it, this is the best brand on the market)
(usually i had a mix of ProColour, ProVeg & Prima and they got a big pinch once or twice a day)
FROZEN:
Prawn
Krill
Mysis
Artemia
Bloodworm
Cockle
Muscle
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Best think i ever did was:
Blend loads of frozen foods (you can also buy packs of mix frozen seafoods from the supermarket), spirulina (can also use Nori seaweed sheets) and also grated raw garlic. I added a little water to make it a chunky paste and spread it out on a tray to make a sheet and froze it. When frozen i clingfilmed it and broke off a chunk each day.
Sometimes i added the budds (flowers) off the broccoli as well.
I always useda base mix of bloodworm, prawn and krill and anything else i added was changed a bit each time i made a batch.
Seafood protein is far better than beef protein.