a couple week ago i posted about breeding my male plakat with my female veil tale.. i had the setup which ive included a pic of below and everything seemed ready to go. When i released the female she nearly killed my male plakat which is three times her size! he didnt make a nest within the first week and then they were introduced but i just dont see how she could do that to him..

ive been treating him with melafix and aquarium salt and hes eating but torn to shreds.. should i try this female with one of my veil tails? what do you guys think went wrong? and one more quick question i heard freeze dried blood worms work when conditioning bettas, is this true? and can bettas breed at a temp of 78f? thanks for any help!