well the tanks been up already for about 2 months...got my first algea growth...i spent a good couple hours researching it but didnt find anything that looked like it...i mean it kinda looks like black beard...but then again some of the pics i saw dont resemble it...i have 2 otto's in there...a silver aro and a spiny eel...im gonna leave the lights off for a couple days and double dose excel...any other suggestions...if it doesnt work then i guess ill have to go in and manually clean it...but my aro is still skittish and dont want to stress it out with the cleaning...thanks guys...last one is of my baby silver aro...also i just finished setting up my new 180 so next week i think im going to finally get my co2 kit...hope it helps becuase the plants look a lil rough...i dose excel everyday but they still arent looking to good...