Sounds like the number of fish is small, which is working in your favour. When feeding, make sure there is very little leftover food in the tank.
One major problem I see is that you do water changes only monthly. If you are having cyano or serious on-the-glass algae problems, I would advise increasing water changes to 5-7 gal weekly in a 45g. Clean your filter media in outgoing changewater weekly as well. Great that you are siphoning out the cyano. Do this weekly until it goes away. Keeping to a weekly schedule will do your tank a world of good.
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