ok for clarification here is/was my advice:
add the pigmy and monitor the params, if they become bad then return him, if not then keep him. by adding him for a week or so wont hurt anything.
(i didnt know he was cycling so i dont think he should do this until he is done)
how is this bad advice. you may have an opinion that he cant handle it, but its on the edge and it might work, so why not try it. no fish wil die because if the params get bed then he returns it
You can't push a tank to its breaking point and then expect that returning a fish will solve everything.
We're not just talking about water quality. Fish need space. Clowns can be very territorial, and so can dwarf angels.
I wouldn't have put more than the pair of clowns in the tank at this point. He already stocked too fast, and stocking more could easily crash his tank.
Personally, I'm not saying that a dwarf angel couldn't live happily in a 30 gallon. I'm saying that his tank is already stocked to the max, and it was stocked too fast, and if he adds any more fish, the effect could be bad.