can a pleco, betta and catfish live in brackish water? what temperature?
my dad’s friend gave him a pleco (janitor fish), a catfish and a betta.
right now, the betta is in a small betta tank, while the pleco and catfish are in a 10 gallon tank. my dad says that his friend let them all live in 1 tank and got along pretty well. so i’m planning to combine them.
but today, i just set up the 10 gallon tank for them and i added some “aquarium salt for all freshwater fish” and without a heater. the pleco and catfish are okay with it.
would adding the betta mean i have to add a heater?
if so, can it survive in brackish water and can the heater affect catfish and pleco be able?
i’m not sure what kind my catfish is.
here are pictures:
http://i208.photobucket.com/albums/bb303/tohrusan/DSC01436.jpg
http://i208.photobucket.com/albums/bb303/tohrusan/DSC01435.jpg
sorry, they are pretty bad quality.
but basically he’s small, black with white vertical stripes and a light belly.
can anyone tell me what kind he is?
thanks in advance. 
Those pictures are basically impossible to distinguish the catfish with any real certainty. Though my guess would be a bumblebee catfish. If that’s what it is, it needs a minimum of 45-55 gallons. Plecostomus can get very large, and most types require a minimum of 125 gallons. You need a heater with or without the betta, at the very least in the winter months unless you are in a tropical area. “Aquarium salt” does not make a tank brackish, only marine salt does that. Most catfish can handle low-end brackish tanks(specific gravity less than 1.005) as long as the salt is added in a separate container, and slowly added to the tank.
It could be a Bumblebee catfish, there are two types and I cant tell which from your photos.
http://www.planetcatfish.com/catelog/species.php?species_id=928
http://www.planetcatfish.com/catelog/species.php?species_id=708
Either way, you are going to need a bigger tank. The Pleco could grow to more than a foot long, but they are generally peacefull toward anything except sometimes other plecos.
You will need a heater unless your room is constantly warm. Around 25C (77F) will be OK for all those fish.
Go easy on the aquarium salt, plecos do NOT tolerate it well. A small amount shouldn’t harm them, but use less than the recommended amount (50%?)
But apart from those things, the fish should be OK living together.
Ian
http://bettacare101.co.nr