Same with mine tries to swim with his tank mate and annoys the crap out of him.
Still splashes around at night though... got me buggered what he's playing at though.
Only been 3 nights mate but havent had a splash out of him since he went in. he is a love junkie fortunately his tankmates, a couple bigger than him, some smaller are tolerant of it. Am going to bring my tandanus together [different tank ] and see if their behaviour changes.Loving those rainbows to, 3out of 4,1 particularly strong have coloured up, this tank gets early morning sunlight and it makes those colours pop. [ way to go MM not just feeding a mans fish habit. Stoking it! :) ]