yeah, I get algea buildup in clear/opaque containers, I find that blue tinted ones have a lot less of this problem though...it doesn't really bother me though, I use it to remind me to totally scrub down the systems, heh...spacing, I'm not sure how tight you could pack 'em, probably as close as you could get 'em, but I usually go for 2 - 2 1/2" centers... |