I use viso therm the one merediths link sends you to
two gallon with 16 gph
filter with live plants and a female betta named Meloday
3-4 gallon with 80gph ... Planted lightly three white clouds ( Birtha Clara and Delila) and some snails (mainly melodys snacks)
9 gallon with 130gph , heated with male betta (Trafalger RIP)Kaden ( a male betta)has moved in, pygmy cory (MaMa) , pitbull pleco(Metal), three preacox rainbows( Annabel, Glitter and Mondo) and various snails...