venturi

Hi – I'm a new fish owner. I have five rosy barbs in a 100 litre tank. I'm using an Aquael Turbo 1000 water filter. The filter has a venturi that brings in oxygen to the water but makes a very loud operating noise. When it's turned on the fish seem distressed by the noise. They hide at the...

I'm a bit concerned with the tiny micro bubbles that my Interpet PF-1 is throwing out. I understand the concept of aeration, maximising surface area for gas exchange etc and I know that bubbles are not necessary as such, just surface agitation. However, I recently suffered a nitrite spike due to...