Why is my algae red?

[BLASK]

Someone told me that red algae is a sign of too much metals in the water, is this true? Will my fish get sick??

20gal fresh
0am, 0nit, 10nate, 7.4ph, 79deg F
6platy 1"
6neon tetra .80"
2albino cats 1"
2khuli loach 1.5"


I just added 3 otos tonight to take care of it. I hope they will be ok

 

[WILDER]

http/www.thetropicaltank.co.uk/algae.htm