Fluval tanks are nice, but they can be difficult. Here is my rundown of their tanks:
The Fluval Edge is an awesome designer tank, my favorite of the fluval series. I love tanks where you don't see cords hanging all over the place. However, due to it only being 6 gallons, you are limited on what you can stock in the tank. I personally wouldn't keep a betta in the tank because the water level is suppose to be kept to the top of the glass. This only leaves a small hole for breathing. You could keep the water level down but I feel it takes away from the design. Also, keeping the water at this level might cause more water turbulence and make it hard for the fish to swim. Another issue with the edge is the lighting. The stock halogen bulbs that come with the tank can cause temperature fluctuations. Some brilliant people have upgraded the lighting to LEDs which don't get hot and even added additional lighting by rewiring different lighting. Another problem with the lighting is it is inadequate to light the tank. You could cluster the plants right under the lighting, but plants outside of the spotlight in the tank won't do well. Also, because of the small opening, this tank is really hard to clean. Not impossible but you have to be really dedicated to keeping this tank clean. They make accessories to make cleaning easier. Keeping fast fish in this tank is also difficult because it's so hard to catch them with the little opening.
Fluval Chi tanks are pretty too but you run into lighting problems if you want to keep live plants. Both size tanks are pretty nice but water level needs to be kept low from preventing fish from jumping. They may make an accessory to prevent jumpers, but I haven't seen it. Fluval also recently came out with lots of fake plant accessories for this tank and spiffy tank backgrounds, so keep an eye out if you are interested.
Fluval Spec is an awesome little tank for shrimps and snails. It has a very powerful filtration system that is hidden nicely in the back of the tank. With the LED lights, you can probably keep low light plants in the tank. The tank is more of a pico tank than a nano. Swimming room is probably only ~1.5 gallons in this 2 gallon tank, 0.5 gallons is in the area with the filtration. Not really ideal for any fishy to swim in.
Fluval Ebi/Fluval Flora are probably the best of the fluval series to keep bettas in. They are 8 gallon tanks that come with a glass cover to keep jumpers in. Fluval Ebi comes with stuff to prepare the tank for shrimps, shrimp food and other stuff. It comes with the same light as the Fluval Flora, so you can grow plants in the Ebi. Fluval Flora comes with everything you need to make a nice planted tank, good substrate, decent light, and injectable CO2. Both have a fake rock background and pretty much come with everything you need to start a tank.
Hope this helps ;)
Last edited by ilovebunnies; 12-27-2010 at 02:22 PM.