Well too late for that now :/ I used the same gravel in both tanks… they seem to be happy tho!
UPETTOOLS Aquarium Biochemical Sponge Filter, Ultra Quiet Aquarium Air Pump Bio Sponge Fish Tank Foam Filter Comes with 4/2 Spare Sponges 4/2 Bag of Bio Ceramic Media Balls https://a.co/d/1UlNLJ5
Is this the sponge filter with media? Why did you buy separate media? I wanna get a sponge filter because the suction of the hanging filter I have seems to be a little strong for betta. Also, floating plants get tossed all over the tank.