Well, if you were plunked into a crumby situation, you wouldn't just die from in within a day. Deterioration of health and muscle mass can take time, anything from a day to many months, depending on how healthy / hardy the fish was to begin with, and how bad the current situation is.
The fact that they aren't growing and are getting sick is indicative that something is wrong.
What are your ammonia and nitrite levels, and for how long has your tank been set up?
Clown fish would definitely better suited to your tank.
As for aggressive fish, that's your choice... just make sure that whatever you do get are compatible.
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90g pltd: angelfish [black, leopard, platinum, silver zebra & gold vt] · glass catfish · harlequin rasbora · neon & rummy nosed tetra · sterpai & spotted cory · bristlenose pleco
28g pltd: scarlet badis · oto cats · bristlenose
16g pltd: flame & honey gourami · cherry barbs
8g (soon to be 18g): 15 lbs LR · 10 lbs LS · YSP · zoas · shrooms · flame & hammer corals · brittle star · scarlet & electric blue hermits · firefish
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