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OK I’m sure that a lot of people will jump on this but no one here can really figure out what is wrong with your tank. (and that includes me).

Here are some things to check:

Are you dumping 50% of your water each week?
Do you have kits to test for Potassium, Phosphate and Nitrate? And what are the values?
If you are worried about iron, do you have an iron test kit? The only way to know if it is low is to test for it.
What is the pH, kH, gH of your water?
What kind and how many fish do you have in your tank?
If you are going to do EI with CO2 you need more light.
How long has your tank been set up?
Tell us more about the algae bloom?

OK here is the good news. Tanks go through a normal cycle whenever you change something. If you keep things reasonably constant they come to equilibrium and some things will do well and others will not. This is called a niche. In your niche, it may mean that given the conditions you have, hygrophila corymbosa cannot grow there.

If hygrophila corymbosa fails try something else.
 

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It is still impossible to say what is causing the problem but it is likely the result of your dosing plan or the inclusion of the algae killer. I’d drop the algaecide since in the long run you don’t want to be using it in you tank and some products will cause plant melt.

If you are going to use EI, follow it EXACTLY. If you don’t you are going to worry about what is missing. It probably will not solve your problem by adding what is missing but it will take away the guilt you have for not adding it.

OK now about algae!
I’d add more algae eaters. You have 2 Oto’s but they are not going to consume to the level of algae that you have. You have a 30 gal tank so you can fit 2 Siamese Algae eaters in it and 7-8 Oto Cats. Think about adding (this is hard for me to say but it is good advice) some snails. They are great at eating algae but you will have the problem of getting rid of them when the algae is gone.

This is my opinion so there is no science to back it up. There is plenty of algae in every tank in fact it is good for your fish to have algae in your aquarium. Look at your tank and see the things that are good about it. You have a breeding population of fish. That means it is not so bad from a fish point of view! You are not doing too badly.

Ok, scrape that algae, add those ferts as required, and get those algae eaters! I am sure that if you persist, you will have a great tank!
 
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