Algae Problem - Please Help

I have a 45G tank with 5 Bala Sharks in it and I need some help. My tank has developed what looks to be black algae, everywhere. I had an Otto for about a month, but the stuff still was there. The otto recently died by being sucked into the water jet, but thats another story.

Anywho, what can I do to fix this problem. I am going to replace all plants and attempt a major cleaning tomorrow.

Tank Details.
- 45G
- Plastic Plants & Ornamental Rock
- Tank is cycled
- MarineLabs Penguin Bio-Wheel 360
- Water Temp, 72 degrees
- Nitrate 20/mgL
- Nitrite 0/mgL
- Total Hardness 150GH
- Alkalinity 80KH
- PH 6.8
- Ammonia 0mgL
- 5 Bala Sharks
- About 12' From the living room windows
- Aquarium Light is on for about 12 hours per day

Here are some photos...
http://www.myautoiq.com/tank/tank_1.gif

http://www.myautoiq.com/tank/tank_2.gif

http://www.myautoiq.com/tank/tank_3.gif

http://www.myautoiq.com/tank/tank_4.gif

Other than cleaning and replacing, is there anything else I can do? any water additives I should use?

Tap Water Test

- Ammonia 0mgL
- Nitrate 20mgL
- Nitrite 0mgL
- Hardness 75
- Alkalinity 40
- pH 6.8


Last water change about 3 weeks ago. Been busy with work. :duh:

seems I dont have a phosphate test I only have the Ammonia Quick Dip and Quick Dip Multi-Test both from Jungle.

I am planning on just getting new plants, clean the rock, and take off and try to clean the top layer of gravel.

I was thinking of getting live plants this time around and another Otto (Yes, I'll cap the jet). Should i get the live or wait till i clear up the algae?

Also... the Balas have been hanging out at the bottom rear of the tank for the last week. Is this related?

Thanks, this is what Ill do

- vaccuum all of the gravel
- try to clean the rock
- get all new plants (prolly fake, never had live)
- Scrub the tank with an algae sponge

Should I use any additives, algae "killers" like Algone, Algae Clear, or AlgaeFix?