Thanks guys and gals. I did a lot of manual work last night. Removing what I could from the tank for a minute or two and pulling it off and then scrubbing the rest with a toothbrush. The problem is there is just some stuff that is hard to get at without the entire design of rock tumbling down. Does everyone agree with the phosban gfo rout, or are there some out there who are against it??
Bottom line is that you very likely have an excess of nutrients in the water. If there are nutrients and light, algae will grow. You need to reduce your nutrient load.
All the things people have mentioned will do that for you, but it does not happen fast.
Simplest - Water Changes and Manual Removal. Takes a long time so usually this is done along side the other methods.
Natural - Big Ball of Chaeto - REquires a sump and a light.
- Clean up Crew, - Lawnmower blenny, sea hare, turbo snails etc
GFO, Rowaphos, BioPellets - requires an extra pump and a reactor chamber to be most effective. This is usually how people control nutrients but if you do not have a sump then the extra equipment is hard to hide.
Liquid Carbon dosing - This is your vodka dose. Does the same thing as biolpellets in that it encourages bacteria growth in the tank, as bacteria reproduce they use up both nitrates and phosphates(one more than the other but i forget which way it goes) to build the new cells. Careful with this as it is easy to over dose the tank and you can end up with really cloudy water( best case) that goes away eventually or a tank crash if the bacteria spike to fast, die, and start decomposing(worst case)
Peroxide Dosing - Careful. This will kill your algae and stuff but it is not actually treating your core issue. A small amount of peroxide can have huge impacts to a tank. So research it well.
Go with water changes, and the animals listed. That will keep things in check usually. Research the last two as there is no extra equipment involved.
Double check my info as well as it has been a long time since I have researched such things, I think its fairly accurate though.