The water itself holds little to no bacteria, most of it will be in the filtration so adding filter media from the old tank to the new tank will speed up the cycling process.
Long term or hell even short term that tank will not be able to house the Flowerhorn or the Red Devil as they will outgrow it. Not to mention both fish have nasty temperaments so they might kills one another off.
Long term or hell even short term that tank will not be able to house the Flowerhorn or the Red Devil as they will outgrow it. Not to mention both fish have nasty temperaments so they might kills one another off.