A friend of mine got a pair of baby CB endlis in a trade a couple of weeks back.They're currently in a 4 foot 110g (only 18" Wide).He's looking into rehoming them because of how big they get.How much time has he got until they hit the 18" mark?The filtration is a trickle filter which has a turnover of about 8x ph and he says he does a 60% water change weekly.(they are currently about 4" ish)