I found it easy to control with just changing surface agitation. Some like shimmer, some don't. I don't care either way, but even with 100x constant turnover I just point the returns down and that tank had 0 shimmer, but that is also because of all the pucks.I for one don't like the shimmer from led lights. looks like a disco club. This is where the t5 light come into play. I wish the led lights did not have the shimmer I would opt for led light then..


