What size of tank? And do you have the angel already or the shark? Cus the shark isn't a huge algea eater, it'll graze on it but won't clear a tank of it. Also is there other fish you have or are considering?
I have a 1 1/2" Red Tail shark in a 75G with two 1 1/2" Angel fish; no interaction at all between them.
Regarding the one Angel fish you plan. I would suggest two. I had one Angel fish and he seemed very lonely. After a couple weeks I went back to the store and bought a second one (from the same tank I bought the first). What a difference; the two are inseparable. They both swim around the tank together constantly. I didn't realize Angels were schooling fish.
The single Red Tail shark, on the other hand, seems to be enjoying himself. I have an AC110 filter and he is constantly swimming up the flow and entering the filter. He swims around the bio-media bag for a few minutes, then takes the plunge down the out-flow slide. I had to add a plastic barrier to the glass hood to keep him from accidentally jumping up on it and getting stuck.
Thanks everyone I'm glad it will work. Some guy pm me about getting a Flag Tail Fish.......... those get huge :S so im defenatly not getting one of them.
My RTBS Was an A** he chased and harassed everyone and didn't want anyone to eat. it was not strange to see a minor battle wound on any one of my fish.