Cardinal Tetra's And Red Fin Tetras

[dave_gray2077]

Today while feeding my tetras their flake food and a few dried tubifex i dropped an algae wafer into the tank for my shrimps and ottos to nibble.

Now the tetras ate all the flakes and tubifex in about 1 min then a few of them noticed the algae waffer on the bottom of the tank and now they are eating that to.
2 of my red fin tetras are also facing off with the shrips over it.

Is this normal?
Is this caused by underfeeding?

And most inportantly will it harm them?

 

[n3ont3tra]

Is this normal? Probably. I put Hikari Sinking Wafers in for my kuhlies and my platies and neons eat it.
Is this caused by underfeeding? I doubt it. I probably overfeed. The platies and neons eat more of the sinking wafers than the flake food, the kuhlies seem to like the flake food a lot more.

And most inportantly will it harm them?
I don't see how it could harm them.

 

[dave_gray2077]

thanks