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Two. They need a min. of 20 gallons each.
People most commonly suggest 6 guppies, but with the oversized filter in the fluval edge, you might be able to get away with 8. Just try to keep 2 females for each male if you decide to try to breed them.
The only Fluval filters I have seen and used are external cannister types and they are amongst the very best perfoming filters available. I have never heard of an in tank Fluval.
It depends on the size of the tank. Ideally most people get 5 gallon buckets of reef salt for ideal tanks.
Two Hydor Koralia 3 Power heads are needed to keep the proper current flow in a 75 gal. saltwater reef tank.
Not unless you have an 800+ gallon tank and even that might be risky.
Remove the sick fish..... the fish that has the ich should be put in a hospital tank then treated for ich, corals do not get ich, only the fish, so a ten gallon tank with a aerator would be ideal for a hospital tank....
I can answer your question without you having to search and search. The good rule of thumb for freshwater is one inch of fish for every one gallon, but goldfish and saltwater are different. Goldfish need 3 gallons of water to every inch of fish, same goes for saltwater.
i think you would need a medium tank for your fish.
Aquariums can be very expensive but they don't have to be. If you buy a tank that isn't too big then you can find one at a reasonable price, around ten dollars for a ten gallon tank.
uhhh.. yeh buddy
No.