I bought some topfin preconditioned aquarium water for freshwater fish. Is it safe for my baby turtle also?

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Your going to need a thermometer, I suggest the simple kind that's just a sticker changing colors telling you the temp, in expensive and works. Most fresh water fish like 70-76Fdeg water, saltwater fish around 60F. if the thermometer reads too low, just plug it in, turn the temp adjustment knob just until the light comes on, wait for 10-20 mins, check your temp again and repeat steps if your still too low. once set, you shouldn't have to touch it again for a long time. Higher freshwater temps in the 80's stresses the fish out, and makes their metabolism run fast. They will live, but they will also require more feedings. Too low and they will become sluggish. Completely normal. Main thing is to keep them comfortable, don't try to change the temp to quickly. That stresses them as well. 5-10deg change over and hour is usually fine for most fish. The heater is primarily used to prevent a too low temp "below 60F" if you set it to 65, you should be just fine, you house will warm the tank up in the day time in most cases and the cycle in temp helps the fish to determine daytime and nighttime better.

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Siamese fighters, also known as Siamese fighting fish or bettas, are colorful freshwater fish with long, flowing fins. They are known as hardy fish, and are relatively easy to care for. These fish can be aggressive, and two males kept in the same aquarium will often fight each other, hence their name. Because of this aggression, breeding bettas can sometimes be a bit tricky. Care must be taken to ensure that the female betta is not injured. However, when the proper steps are taken, breeding Siamese fighters can be a success.

Set up a breeding aquarium. This aquarium should be small, only 10 gallons, and should have only about 6 inches of fresh water in it. Place tall plants in the aquarium. These plants will provide a place for the male to anchor his bubble nest. This nest is where the eggs will be kept once their laid. You can also provide an artificial anchor, such as half a styrofoam cup, if you feel it's necessary. Place a thermometer in the breeding aquarium and monitor the temperature of the water. When breeding, Siamese fighters prefer a temperature that hovers right around 80 degrees Fahrenheit. Place a divider in one side of the aquarium. This can be a regular aquarium divider, or a glass chimney. The divider will protect the female from the male until their ready to breed. However, the divider should let the male see the female, so that he will begin preparing to breed. Find a healthy pair of bettas. Male bettas usually have longer fins that the female fish. Males also tend to be more colorful than the female bettas, which can appear somewhat washed out. Place the male in the largest part of the aquarium. Place the female behind the divider. Condition the fish, preparing them to breed. Do this by feeding both the male and female fish live or frozen, then thawed, meaty foods, such as brine shrimp or bloodworms. Observe the fish. When the male is ready to breed, he will begin to construct a bubble nest. This nest will be clearly visible at the top of the aquarium, and will be several layers deep when it's finished. When the female is ready to breed, she will display dark bars along her sides. A white breeding tube will also show under her pelvic fin. Release the female into the main part of the aquarium, with the male. The male will chase the female around, and may bite or nip, in order to entice the female under the bubble nest. The male will then wrap around the female, squeezing until the female releases the eggs. Remove the female as soon as the spawning is over, or the male may kill her. The male will continue caring for the eggs, and later, for the young fish, until they are free swimming.

Facts Sheet: How to breed siamise fighting fish
http://aqualandpetsplus.com/Betta, Breeding basics.htm More information on Siamese Fighting Fish http://animal-world.com/encyclo/fresh/anabantoids/bettas.php

I am no expert with CO2 but i would say that for the amount of plants you have going by the picture vs the amount of fish you shouldnt really need the CO2 at all.
One way to naturally increase CO2 is to run less or no bubbles in the day while the plants are using the CO2 and producing Oxygen and then run bubbles over night to clear out the CO2 the plants produce at night to okeep it safe for the fish.

The spectrum of light is measured by the Kelvin scale (K). Natural sunlight is 5500K. Most freshwater fish will thrive in aquariums with a Kelvin rating of between 5500 and 6500K; whereas reefs and deep-water saltwater fish need a light around 10,000K.

The type of filter you buy all depends on the size of tank you have and how many fish you keep in the tank. You should go to a local pet store and inquire from a professional to point you in the right direction.

There are some limiting factors like the oxygen availability and the filtration processing. I gave you some examples below they all refer for small or large freshwater fish.

3 cm of adult fish length per 4 liters of water.1 cm of adult fish length per 30 square centimeters of surface area. 1 inch of adult fish length per US gallon of water. 1 inch of adult fish length per 12 square inches of surface area.

This is mostly based on personal preference. Saltwater aquariums are more difficult to maintain; however the choices of fish are more desirable. I prefer a freshwater aquarium. The maintenance is considerably less and there is still a wide variety of colorful fish to choose from.

Things You'll Need:

• Aquarium vacuum
• Additional freshwater
• Fish food
• Commercial medication (optional)

• Step 1:Vacuum the aquarium. Sweep the bottom of the tank with the vacuum to remove the hydra and a majority of their food sources. Use the aquarium vacuum as needed to keep the freshwater aquarium clean. This will prevent more hydra from appearing in your aquarium.
• Step 2:Replace any lost water. Vacuuming the aquarium will pull out a fair amount of water. Replenish the aquarium with additional freshwater. Northern State University suggests using freshly collected pond water or rain water.
• Step 3:Reduce the amount of food you feed the fish in the tank. Temporarily decreasing the amount of food will result in larger fish feeding on the hydra and eliminating a source of food for the hydra. If food is unavailable, hydra reproduction will cease and they will eventually shrink then die.
• Step 4:Repeat these steps as necessary. Continue the three-step process until all signs of hydra are gone. Negligence in cleaning the tank or feeding the fish ample amounts will allow the hydra to feed as well, and thus rapidly reproduce. Continuing the steps is also a maintenance measure that will prevent additional hydra from developing in your freshwater aquarium.

Tips & Warnings

• Aquarium-supply stores sell various medications that reportedly kill hydra.
• The steps you take to kill freshwater hydra could also kill small fish in your tank. Prepare to lose some small freshwater fish fry in the process.

The silicone most be 100% silicone appropriate for aquarium use. If the sealant tube did not say this on the tube it is not safe for use in aquariums. They sell this type at pet stores that sell fish. Also make sure you use acetone to clean surface before applying sealant.