I too don’t currently use aristones regularly. However, I keep battery operated pumps for electrical emergencies. But I don’t have a large fishroom or anything like that, where air-driven filtration is the almost inescapably more economic method.
Importance of aquarium aeration
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ditto, just used some battery operated air stones last week when the city performed some maintenance during a planned power outage.
When I had a 20 tank fish room, I would put @ 5 or more tanks on a single sump, all fed with 1 decent size pump, so economy may be relative.
And using each pump, one turn of a valve, and old water could be sent to the garden. So a couple hundred gallon water change might take 5 minutes with very little effort.
Riverine fish would require water to flow perpendicular to the gils. This may be anecdotal but I will offer it anyway…..Im an avid angler and practice catch and release. Sometimes, removing a hook has the fish out of water for bit. The fish will become sluggish and you can not just throw them back in that state. It’s common practice to hold them in the water for a minute with its face into the current to revive them. Hokding them in the opposite direction does nothing. The fish seems to get more out of the water running passed the gills in the direction of head to tail.
Ime, this is because the fish is just too tired to open its gills on its own and needs the water literally forced down its throat and through the gills to recover. After all it just fought for its life trying to escape your hook. I always just hold them loosely until they swim away on their own power.
