whats a good canister filter for my 45g reef

[donkey77]

its the deep sea aquatics neo nano 34g, 25g sump, vortec mp10, two little fishes phosban reactor, AI del sol led, 34lbs LR, 30lbs live sand, 4 fish and corals, blastos, zoos, ect. i do water changes every sunday , all i have in my sump is some black sponge filter ,and of course all the other stuff heater, etc
should i have better filtration cause iam getting this long skinny brown alge, my take is about a month old, i got cured LR and sand from an established system, anyways any help thanks