The best thing to do, after your second blackout is to get some live plants, hardy ones like anubias do well in low lit tanks, java fern and if you want fast growing plants then get some hornwort, from my own experience plants like water sprite and other plants demand more light.

This will definitely help with your algae problems, due to the fact that plants outcompete algae for nutrients and fish love em too!

Have you tested your tap water for phospates? Algae from what I've read thrives on excess phosphates and since your tank lacks any competitors (apart from the moss ball) any excess is freely available to the green algae.

So IMHO here are your options:

1) Another blackout
2) Some live plants
3) UV Sterilizer

Good Luck and keep us updated

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195G Pleco - 13" Clown Knife - 14" Silver tinfoil barb - 7", 7 Clown loaches - 4-5" 1 Black ghost knife - 7" 2 Tilapias - 4" 2 GT's - 3"

It is with cautious optimism that I declare a perceived victory over the algae bloom.

After a second 5-day blackout, the water was only slightly cloudy once the shroud came off. The fish are happy, healthy, and hungry!

After changing 50% of the water, we're now at 24 hours of virtually crystal-clear water.

Testing 24 hours after ending the blackout, I get the following:

Ammonia: less than .25 ppm
Nitrite: 0 ppm
Nitrate: 10 ppm

Which seems to say that my tank has finally moved on from its infestation.

Thanks to all those who responded!

keepin our fingers crossed

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90 gallon, 1 Iridescent shark, 2 Pleco, 3 Goldfish, 5 Cory cats, 2 Nerite snails
5 gallon hex, Blue Crowntail Betta, 1 nerite snail,