They are the same as the ones for plants as long as you don't buy the kind that has fertilizer additives.
Pro Tip: Oranges are kinda like a roach-viagra and including them in your roaches diet will likely lead to an increase in production... the tip here, is to squeeze (fresh) orange juice over your water crystals after they've been made, so you no longer have to worry about oranges molding, but you still get the benefits.
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