Algae bad?

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I have some nice algae growing on my back glass but was a little concerned b/c I am having water quality issues (fin rot).
 
Continued fin rot lost about 10 fish in the last year. I read some where that cyno bacteria can be toxic and is red like my algae. Just making sure that that is not the issue b/c it looks sweet!

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I am thinking about wiping it down, but I like the look of it.
 
I can never tell on the chart but over 40 last time I checked. Tap is under 40. I have been doing water changes pretty much every day for the last week. I will test again and post results later today.
 
Could be. I just can't read the chart very well. 40 is where it changes from orange to red, and I can tell the difference.
 
Ok, results are in. Ph -8, nitrites -0, ammonia - .25, nitrates - 30 (down from 80 a week ago)
Tap is the same except ammonia looked a little greener - .5 & nitrates are 5.

Guess I just need to keep up the water changes. I am doing around 10 gallons daily. Should I do 20 gallons a day?
 
I'm not sure what tank size this is but prolonged exposure to nitrates would explain the fin rot. You need to perform enough water changes to keep the nitrates below 20ppm. I do 50-60% weekly on every tank as this keeps even some of heavily stocked tanks under 20ppm.
 
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Sorry 56 gallon. I have been changing around 20 gallons. Then I dropped to around 15 gallons since I was doing them every day.
 
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