Reddit reviews Cascade Heat 10" Aquarium Heater 150 Watt for 30 Gallon Tanks
We found 1 Reddit comments about Cascade Heat 10" Aquarium Heater 150 Watt for 30 Gallon Tanks. Here are the top ones, ranked by their Reddit score.
Accurately maintains the desired temperature in your tankFully submersible and can be placed horizontally or vertically in your tankEasy to set and accurate to 1° Fahrenheit.Shock resistent glass with superior insulation.Perfect for fresh and salt water environments.
http://www.walmart.com/ip/Tetra-Heater-10-30-Fish-Aquatic-Pets/10291809
http://www.amazon.com/Cascade%C2%AE-Heat%C2%AE-Aquarium-Heater-Gallon/dp/B000VOCXUK
http://www.petco.com/product/114078/Tetra-Submersible-Aquarium-Heaters.aspx
Most 30 gallon heaters will be less than 20$. Just go buy one and your options for the tank will open up so much more. You can find plenty of cold water varieties(their are a couple species of barbs and locahes that don't mind or even love cold water) but tropical species are just so much more enjoyable to watch.
But if you are dead set on a cold water tank:
Barbs:
Gold Barb
Rosy Barb
Green Barb
Loaches:
Weather loach(might get to big, and can be aggressive towards other fish)
Hillstream Loach
Tetras(although they definitely like warm water better they can tolerate cold water conditions):
Bloodfin tetra
Buenos Aires Tetra
Danios:(these fish will school well if you have 6 ot 7 of them in a 30 gallon tank, especially if you have a SMALLER powerhead to make a current of some sort)
Pearl danio
Zebra danio
There is also guppies, they will survive anything.