Where to start...
Anemonekeeper, you need to step back from the tank for a second and think about what you are doing. You are trying to create a little slice of a coral reef in your tank. The path to success is to try to replicate all of the natural systems present on a reef in the wild. If you can't recreate them naturally, you need to provide them artificially. Therefore:
Tropical sun > bright artificial lighting
Wind and waves > strong water movement via pumps
Large body of warm water > stable temperature maintenance via heaters
Clean water > low ratio of waste-producing critters to waste-processing critters
You do not have bright enough light to keep photosynthetic creatures. It's like you're trying to grow a rose using a flashlight. All you'd end up with is a bunch of mushrooms.
Additionally, you do not have enough live rock to process the waste being generated by your large anemones. This can be offset somewhat if you give your tank enough time to "cycle" and for beneficial bacteria to colonize the entire tank (substrate, etc) but you have added your large critters too soon.
Finally, do not feed your anemones large chunks of ANYTHING. In fact, anemones can grow just fine in a reef tank with no supplemental feeding if they have bright lighting and you add food for your fish and they can snag some of it out of the water column. Think about those chunks of shrimp rotting in your tank - because that is what is happening when you add dead material like that to your system. Even if the anemone "eats" it, the anemone still excretes waste material after processing the parts of the food that it needs. Heavy feeding leads to big spikes in ammonia; and if your tank can't handle processing it via biological filtration, the water becomes toxic.
Being 14 and not having a lot of money, you need to step back and prioritize your approach to building the awesome tank that you CAN afford. Better to start with a small system with all the right equipment, than to rush to the finish line and load up your tank with a few large animals without the system to keep them alive. I don't want you to feel bad or become depressed because you aren't having success with reef tanks. However to continue to buy animals for your system without fixing the underlying problems first is to condemn them to death. Make your slice of the reef first. THEN add the animals to it.
