ok ive been reading and reading and reading , i have more then enough flow i have movement all round the tank i move the drop checker regularly ive reduced lighting and lighting period and still cant beat it i can reduce it but not beat it , all points to co2 distribution so going to firstly tweak the amount of co2 up very gradually im sure by drop checker and visualy ive got more then enough co2 going in so much it even builds up at the end of spray bar and every so often comes out in large bubbles ( not wasted ive placed a korrola above it to split and push round tank ) im useing a boyu up attomiser which ive read good reports on , so suggestions please on a better diffuser or am i missing something ?