Bristlenose catfish
yes
A 20-gallon tank can comfortably house around 5 to 7 mollies.
none because mollies need 5gallons and up
Mollies,Platies, Guppies, small Tetras (I recommend Black Skirt Tetras), Corydoras, (Electric or German) Blue Ram Cichlid, and last but not least............ Apple Snails. ;)
The answer depends on the number of guppies. A few guppies can live in a 2.5 gallon tank or larger, temperature between 72 and 80 degrees Fahrenheit. Many people raise fancy guppies in 5.5 and 10 gallon tanks.
30 gallon is a big space you could get 6 more but make sure to get male female 1:3
no
4,000
yes they can, depending on how many guppies you plan on getting.
It's recommended to keep 1 inch of fish per gallon of water. Guppies usually grow up to 2 inches in size, so you can keep around 4 guppies in an 8-gallon tank. However, remember that factors like filtration, water quality, and tank decorations also play a role in determining the suitable number of fish.
they will do fine together just make sure that you have at least one gallon per fish! you could get at least six of each unless you want to put some others in there or if you already have some in there
it depends how big the tank is. since this type of fish stays relatively small, use the one inch of fish per gallon of water rule. mollies are a grouping fish and should be kept with 4-6 or more of their own kind. you can keep them with platies, guppies, swordtails, endlers livebearers.... many freshwater peacefull fish will 'play nicely' with them.