Decorations (bridges, houses, caves, etc.), plants (live or fake), or even mini statues that you are willing to sacrifice.
I have freshwater fish and i use aquarium salt. I put more in every time i do a water change
If you have never set up a freshwater aquarium before, it would be best to call an expert. Check Yelp listings for some freshwater aquarium stores in your area. You will find reviews on them and choose which company is best for you.
I would say yes it would be ok not to put anything at the bottom of the aquarium. Gravel, stone and plastics are usually used for appearance. If it is a freshwater aquarium and if you plan on using live plants then gravel is necessary.If it is a salt water aquarium then it is necessary to use live rock and live stone.
I think it doesn't depending on how much you put in the water. My class put goldfish in a cup with water and BTB. It had absolutely no effect on the fish.
Snake-heads which are now illegal and that's if your talking about freshwater aquarium.
I think marine aquariums are saltwater unlike freshwater that do not have saltwater
Good choices would be a pea puffer, spotted puffer, or a figure 8 puffer
Have a freshwater aquarium or some sort of freshwater aquarium and feed it plants, like lettuce or kale. Make sure to occasionally clean out it's home!
They're designed for salt water, not fresh water! Just the way they are made. You can get aquarium salt from your local pet store, but don't put any in there if you have other freshwater fish that don't need it. Or get a tropical freshwater fish like mollies instead!
besause they have a type of body skin
No! :)No freshwater aquarium fish to my knowledge is poisonous.
No, the minerals that help make up the starfish will contaminate the water and through off your chemical balance.