Hey MissMaddylyn Congrats on the brand new tank. I'll give you a list of some of the fish that are kept in larger aquariums that I personally enjoy. Some setups might include:
1. Discus-These fish are not that hard keep despite what you might read online. Each one can get around 9-10 inches if kept in good conditions and they are absolutely gorgeous.
2. Arowana- My personal favorite fish, they're extremely hardy but at the same time graceful. They tend to swim at the top and they look like the Chinese Dragons. In the U.S. asian arowana are still illegal but I'm pretty sure you can still get your hands on a black, silver, or jardini arowana. However keep in mind that you might have to upgrade again because they get very large.
3. Bichir- These are big fish that look like gars mixed with rattle snakes. They're bottom dwellers and not that active.
4. African Cichlids- Endless possibilities of stock lists for these fish. Some get a lot bigger than others. They range from around 4 inches to 20 for the big ones. You can overstock these in your tank and it would be a definite eye catcher for anyone that visits your home.
That's about it for now i guess, a 135 gallon really isn't that big. If I were you, I'd just go straight for a 200 gallon. It's a good size that really enables you to raise a lot of different types of fish. I would put a florida gar in a minimum of 200 gallons since it gets so big.
now next topic. FILTERS- I'm going to give u the filters that I like on big tanks okay?
1. Sump/Refugium- THIS IS THE BEST TYPE OF FILTRATION PERIOD.
these types of filters keep the water sparkling clean crystal clear. However, they're extremely pricey sometimes, but you can get great deals from local aqua stores probably.
2. Canister Filters- Extremely strong filters that take all the nitrates out of the water and store them until you take it out. These filters are extremely affective and you will only have to do water changes like once a month. However, I still don't like maintaining them.
Well enjoy ur brand new tank