Having your lfs
test the water you are buying is fine but you really need to test for phosphates in your tank as well. Also, keep in mind that phosphates and nitrates, even though you are having none show on your test, there are some still in the system. Only the cyano
and algaes you have are removing these amounts for you. Doing extra water changes will help with starving the cyano
. You could try the chemical treatments. These are normally only temporary fixes. If you don't adjust what is causing the problem, the cyano
will regroup and come back over time. Also, drop back to feeding once every other day. What are you feeding? Lots of prepared fish foods are full of phosphates as well.