Algae and anaerobic bio filter i have.

Could i get one of you guys to explain,for me and roy(he won't ask) what they do and how and why you said i need it or something like it.

Algae, this stuff is so important that if it wasn’t a huge part of the ocean, the ocean would die!
There is a bit on the website about algae’s if this isn’t good enough.

Just imagine all the impurities that end up in water,toxins,pee,oil,chemicals,nitrates any waste, well these creatures will absorb and convert it with the help of your uv lights or the sun into glucose, amino acids, harmless carbons and trace elements for your corals,Etc.Once converted substances cannot return to what they were!

When algae go pale as it looses its chlorophyll, you have done something wrong.
In the home aquarium system we should try to emulate the shoreline algae functions, as we cannot efficiently mimic the main ocean cleansing mechanism, the Phytoplankton community.
These creatures exist near the oceans surface and clean the ocean; they also make a lot of the earth’s oxygen and convert tons of carbon dioxide into there shells of silica, which we mine for many uses.
This little creature is the basis for food for the juvenile fish and inverts as they grow moving around while living with in the plankton that we use in our aquariums and line fish for as well.

In your aquarium you need to have the algae near to the light and have a substantial current to help it clean itself. There should also be a particle filter before and after the algae (filter wool as such).
Algae do not need overly intense light, just a good spectrum, as each algae will function at its optimum under different lighting, so a broad spectrum, full spectrum or mix up some lights to achieve this.

Anaerobic (nitrate converting bacterial environment) or clean dead spot!!!
These creatures are the only bacteria that can, in numbers, affectively survive in salt water.
This is achieved as a result of them being slightly higher up the evolutionary chain from denitrifying bacteria and if the type of environment that they need is adhered to.

Salt and oxygen combined and also uv light will kill these creatures, disrupting the equilibrium between the base and acid that is PH and may cause damage to your more delicate fishes internal organs as nitrate does through lengthy exposure.
As you can see now the set up plan you worked off to make the algae scrubber and denitrator compliments all necessary functions for clean stable water, with little maintenance.
That dry section mate needs to be upgraded as soon as you can!

I have a plan for a very simple small one I can send you if you like.
That fish you want to get should be an ocelaris or a percula though not as resilient and pet country has some nice ones at the moment. I will get you a small to medium latezonatus (your favourite) this weekend.