How much flow do you need during a power failure ?

[Taxus812]

I have been playing with making a backup for my tank. I have Eflux wave pumps that are 24VDC. I know the icecap battery back will run them but at 12v. I tested that tonight using a 12v power supply and honestly it baily moves any water.

How much flow is actually needed? would just a ripple do it or should I look into a 12v auxiliary pump ?

 

[BadFish619]

What do you keep? I went almost a full 24 hours with a simple battery pump.

 

[Taxus812]

New tank right now. Just two clowns, two shrimp, some CUC, 2 PJ Cardnels and two Mollies.
I also only have a few frags.

I want to get ahead of this before the tank gets more grown. (I have a generator but it has to be shutdown from 10pm to 6AM. I want to manage for 12hrs of no power. That should cover 90% of my outages. )

 

[BadFish619]

I had a 250 gallon at the time and 2 battery powered pumps. I was just looking for surface agitation and my guys lived through it. Mind you it was only the one day but everyone was fine. Overkill won't hurt though