They were only actually agressive day one the blackice grabbed the snowflake as soon as I dropped it out of the bag and tried to swim around with it in its mouth this lastes about 1 second and then the reverse happened and then the blackice did the twitching move and they went on their way. The snowflake has never bitten the other clown since, it just rushes up to the other at random no agression while eating. Just seems to me like the snowflake is checking the blackice. Im concerned because the blackice is growing faster than the snowflake. Used to be that the snowflake was 2x the size of the blackice not the case anymore.