You could also feed it baby brine shrimp. Once a week I switch to baby brine shrimp. I culture both brineshrimp and phyto so I basically have an unlimited supply of food for him. Just feed daily(at night). If you don't he'll die. Oh btw the only way it will "nuke" your tank is if something's bothering it. Cuz that's its defense mechanism. If it dies from starvation there's a low chance your tank crash and if it does most likely it's from ammonia spike and not toxins. I have a friend that had his for 5 years and died from starvation. His tank is still running.
I don't see why you would need a species tank to feed phyto to it? But anyways I would shut the skimmer off when feeding for a bit and then turn it on
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