I'm having the same problem with an AquaClear filter and current, can you give me an idea how you improvised a spray bar? Thank you!
I say this with the caveat that this is the kind of weido I am. What I did, and one day I will make a better one, was take a flat piece of plastic that used to be part of an aquarium top before I switched to mesh on my ten gallon, right? cut it down to be approimately twice the length of the filter's outlet, and then I cut notches in it on the top and the bottom. I wired that to the filter so it redirects the flow from the outlet, and rather than a heavy current plunging down that volume of water is spread over a wider area. If you have a piece of something aquarium safe kicking around and, and this is very important, wire that will not corrode or otherwise pollute the water, that's one way of doing it.
What would be BETTER, and I will get around to it one of these days, is this. Get a length of of thin PVC pipe or new, clean hosepipe, in either case cut to a length that suits your setup. you're going to get end caps for whatever it is you have, okay? First cut away a piece of pipe to correspond with the filter's outlet, and then drill evenly spaced holes along the length of the pipe...not, I beg you, the same side as the space where the flow from your filter is going to be entering the pipe. this will, again, disperse the water over a wider area, and none of the holes will be producing enough of a current to trouble your axies. Cap the ends of the pipe so that the water goes where you want it to. I have no idea how I'm going to get that to stay in place, wire could work, or maybe creative application of zip ties, but really potent suction cups might be best if you can find them. That will take more doing, you'll want a drill and a jig saw, if you don't own those see if there is a makerspace or a tool library in your area.
Third option is to rig up kind of a slate shelf right under the filter, it does the same thing as the last two options and looks really cool, which is a bonus in my opinion.
Lastly, yesterday I was in a pet store for no other reason than I was in a mall and felt like looking at kittens and I saw a shelf for turtles and newts and frogs and such to get out of the water on, and it occured to me that one could use that for exactly what I've been talking about, but the store was really busy and I had more pressing errands to run so I didn't pick one up. .