Sadly i have woke up thismorn and he has passed away! Gutted! Also one scooter blenny! When i changed the filter media and basket etc the water went pretty cloudy! Surely this has got to be the cause? I still have a clown and a scooter alive. Should i do a water change?
Sorry to hear he didn't make it through the night.
I quickly scanned the posts since our last discussion. Your alkalinity, nitrates, ph are not an issue and should not have had an impact on the fish dying.
Your tank is very young still....I'm not sure you really need reactors on the system yet. The tank should be well cycled by now though.
It's hard to look at dead fish and determine exactly what occcured sometimes. Death causes the fish to lose coloration, etc... that are clues to what is going on. Hence my initial request for closer pictures while he was still alive. Sometimes those closeup pics are hard to obtain with fish, though.
Clowns are extremely susceptible to Brooklynella which can kill rapidly. The worrisome part is that if the fish actually died due to a disease, it is now in your system. Many people don't quarantine fish prior to putting into a display tank and learn to live with different diseases by keeping their fish's immune systems up with good quality foods. Others, me included, quarantine and prophylactically treat for different disease prior to a fish being put in my DT. Typically I keep a fish around 3 months in a smaller system while monitoring and treating. This may minimize chances of getting diseases in a system, but there's always a chance they can still get through treatment protocols. I prophylactially treat for Brooklynella in quarantine with all Clowns due to the high prevalence in this species. If you don't quarantine, this may be something that you wish to begin adding into your hobby. Even if you don't want to treat with medications, you should still observe new fish for a few weeks prior to adding to your tank. Normally any disease would present itself during that time.
If there were no outward signs of disease on the fish, then he may have died from an internal parasite or just from a natural cause!
You are doing water changes every week which is a good thing to ensure you keep doing and getting into the habit of doing as a new aquarium keeper! Good habit to maintain!
Snails on the fish don't indicate disease or parasites. Nassarious snails (and a few other types) are meat eaters and they will only start to eat a fish or another snail, etc... if they are already dead. The snails were just jumping in for a free meal and helping to clean up the aquarium.