As others have said it is common in the first few months but there are some tips to know that you might benefit from.
1 - algae is nothing but beneficial for any tank, the algae acts very similar to plants in that it removes toxins from the water column, it usually doesn't become problematic until it envelopes a tank to the point that plants aren't getting any light through the thick coverage of algae. This being said I do understand than some people consider it unsightly and prefer to not see it. I personally only ever clean the front glass and allow the algae to cover the sides and back as it gives a more natural look and helps with water quality.
2 - if you do want to fight off algae there are a few points to note. First being that most fish and almost all invertebrates eat algae and stocking them for the purpose of eating it is by far the best way to keep algae in check. Further still algae does NOT 100% of the time mean that you have too much light going on. Algae growth can be a sign that you have either too much or not enough light as well as possibly either too much or not enough fertilizer. Generally excessive growth of algae just tells us that the ratio of light/ferts is in some way imbalanced. This means that you have to experiment with tweaking these conditions yourself.
3 - lets say you run your lights 6 hours a day and don't dose fertilizers at all, in this scenario your plants aren't getting enough nutrients to grow, but the algae doesn't require as many as plants and some little amounts of nutrients in you tap water are enough for the algae to outcompete the plants, in this situation adding ferts may assist the plants in out competing the algae and as a result may cause the algae to recede.
4 - in another scenario, you run your lights for 8 hours and dose the recommended amount of ferts on your bottle, your plants are growing but there is an excess amount of nutrients because maybe you only have one Anubis in your whole tank, in this case the plant has everything it needs but there's so much extra nutrients that algae begins up taking the excess and begins growing itself.
5 - or maybe you're dosing just the amount that your plants need but you have so much light going on that the plants don't need that much and so algae begins to grow to utilize the excess light as well.
What I'm trying to illustrate is that your specific tank may have any variation on an imbalance between ferts and lights and we on the forums are unable to give you accurate advice because we don't know your tank like you do.
I hope this makes sense and is of use to you. Good luck with you tank and if you need more detailed information feel free to reply or PM me with more details of your set up.
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