Parrot Fish & FlowerHorn in a 20 gal tank?

is it why my flowerhorn isnt eating alot? he's just swimmin by da filter in da same spot and plus if i give it bak he doesnt want it, he is gonna take care of kois in his 200 gallon now
Try selling the flowerhorn instead. What are your water parameters? Appearance of his poo? He may still be adjusting to the tank if he hasn't eaten yet.

As far as the kois are concerned, I wouldn't try a 200 gallons tank for them. Pond is the best you could provide for kois.
 
Try to imagine living in your bedroom with a clogged toilet that's what the fish feel right now.
 
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