I have a rainbow darter and it is suggested a current be maintained. How do I do this? I have seen fan-like circulators in salt water tanks. Is this the best route? Are there better ways to do this? I have a 20 gallon freshwater tank with a variety of other tropical fish I suspect will also benefit from the circulator.
75gal 2 bala sharks,1glass catfish,3clown loaches 1of each,blue gourami,sun catfish,banjo catfish,giant asian upside down catfish,hillstream loach-10gal 6glowfish/blacklite