Hi Guys, I'm new and my name is Marcus. I'm sure this has been asked before but as a complete novice I'm not sure what to search for. This is my question:
My filter has two settings; Trickle and Pump. The trickle I have been told slowly recycles the water and adds oxygen to the water. The Pump settings also recycles the water but adds oxygen faster by creating a lot more bubbles in the water. I have been told by the owner of the store that the 'Trickle' setting is fine if I have less than 5 fish as the water will recycle and add oxygen at the top of the tank, in a 27 Litre (7 gallon) tank. I have 7 fish in my tank but they are small about 1 inch, so I was told to set the filter on 'Pump' settings so that oxygen can be created faster for all the fish.
I'm confused; how does adding bubbles affect the oxygen level of the water? The 'Trickle' setting has little or no bubbles but the 'Pump' setting has bubbles pumping out like mad (like you see in the fish store).
I should add that the 'Trickle' settings lowers the pump into the water. The 'Pump' setting raises it above water so it kinda splashes down creating the bubbles.
I would very much appreciate any help. Thank you.
P.s. Would the bubbles not scare the fish?