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I have 75 gallon fw tank. I'm using cascade 700 filter. I'm questioning if I should get a second filtration system to use with my current one. If so, what is recommended?

It looks like slick soapy bubbles. I put fish in 4 days ago. Today water has an odor as well. The water had been cloudy but that cleared up today. Now the foam. Have not added any product to the tank. What should I do? I have 5 guppies, 2 swordtails and 1 danio in a 75 gal. They appear to be in...

Why do i have foamy looking air bubbles on the surface of my tank? And will it hurt my fish?

I am new to this but very excited to learn. I just bought a 75 gallon freshwater tank. Gravel substrate, plastic planted. Using Penn plax silent air x5 air pump, cascade 700 canister filter. Using 2 bubble wands running the length of tank in the back. Waterfall bar on top of tank. My issue is...