Long Spine Urchin question

[hrdneglcry]

I have a 120. My Aquatic Life T5 makes a lot of algae on the glass. I've gone to using only two bulbs on a 6 bulb fixture. It must have good reflectors because my Odyssea 4 bulb did not make so much algae or kill purple coraline. I was looking at a long spined Urchin and wondered if they are good at cleaning the glass on the aquarium. Secondly I keep Triggerfish in that tank. A Blue Jaw, a Niger and a Picasso. Would any of these hurt the urchin? Lastly whats the minimum tank size for a large melon size long spine urchin?

 

[Cthulukelele]

Get a large one. Longspines are common as algae control in big aggressive tanks. They're known to occasionally nibble silicone so keep an eye out. They also can get MASSIVE and move around rocks so be prepared for that

 

[Cthulukelele]

For tank size I'd say a 120 is probably the smallest I'd go but be sufficient. Always know where it is when youre working on the tank