a friend has given me an Aquaone maxi 102f filter, this is for a 75l tank but i want to put it in my 30l tank, would this be too powerful for the tank or would it be better?
as another option i have a 130l tank which has a wet dry trickle filter, if i added the filter to this tank would it benefit it enough to make a difference to the water quality or not worth it?
trickle filters are one of the best, imo. It would make a difference.
Any filtration will help. You just don't want any current from it and nowhere the fry can be sucked up into it. Those are the main 2 concerns with fry.