Help Please

[Smells a bit fishy]

ok. My ruby barbs have been eating my angelfish's fins.

I am currently doing a fish in and a fishless cycle. However I have now done a 100% water change on my fishless tank. It's 50 litres. Now what do I do? Move the barbs in it permanently? There's 6 will that be big enough? Or do I move the angelfish in there temporarily until I take the tints back? I would like to keep the rubys though.

Oh also should say that after feeding the angelfish has now gone to laying on her side at the bottom of the tank.

Help please

 

[Smells a bit fishy]

Ok the ruby barbs are in a different tank. Will 50 litres be big enough for them? Also my angel is lying(upright) on the tank floor. Is this normal? Is she just resting? Or is there something more sinister?