06-17-2011, 04:06 PM
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Ohhh.. that's not good. You've stocked waaaaaaaaaay too many fish than your tank/bacterial colony(if any) can handle. I'd return the majority of those fish and correctly cycle your tank. Cycling is when you let your aquarium create a bacterial colony that eliminates ammonia and nitrites, leaving nitrates which are harmless to fish at low levels. This process takes anywhere from 2 weeks to a couple months depending on how you do it. What you did was let the tank run for a week, without any ammonia source which means no bacterial growth. You then introduced a ton of fish (ammonia sources through waste,food, etc) and it's causing an ammonia spike which in turn is fatal to a fishes health. Your shark probably has ich, or ick which is contracted when water conditions aren't good and the fishes immune system is lowered, leaving them vulnerable to such infections, diseases, etc. I've never personally dealt with ich yet, so i cannot give input to that, but i heard raising temp to 80-83 degrees F helps. But first thing i'd do is re-home the majority of the fish.. They, nor the tank, can handle it amount in the tank.