I want to start a small salt water aquarium for my daughter. I am new to the aquarium hobby as I have only had 1 small fresh water aquarium many many years ago. I basically want 2 Ocellaris Clown fish (Nemo) and some cleaner shrimp. I have heard that a FOWLR is much easier than a reef and cheaper as well. My question is what size tank should I start out with for these 2 fish? Should I get a Nano Cube or get a regular tank and the equipment myself? How much will getting a salt water setup for these 2 fish cost? I have been doing some research and I know there is a LOT involoved in getting a salt water tank set up and maintaining it, but I do want to start it up as a hobby along with giving my 2 year old daughter Nemo fish to look at.

I am planning on getting a 30 gallon saltwater aquarium with a power filter, skimmer, heater, ect. I am aware of all the items needed for a saltwater setup. I know that you dont need RO water for a Fish only setup, or most FOWLR setups. I know it is needed for a reef setup. This is all the info I can gather from many websites and a few books. Can I use a conditioner to remove heavy metals, chlorine, chloramine, ect. from the tap water, then add a good salt mix (instant ocean), then age the water and add to tank during water changes, or set up. I know to use conditioned freshwater for top off. Will the conditioned tap water be safe for invertebrates such as cleaner shrimp, hermit crabs, emerald crabs. I know you need it for corals but I cant find info telling me if I need the RO water for inverts such as shrimp or crabs?

I have a 72g with a 20 gallon sump setup as a saltwater coral reef tank. I grow plants above my sump and ended up knocking a small plant pot over and about 1/2 cup of Miracle grow fell into my sump. I tried to get as much out before it circulated through my tank but some still made it to the display. How is this stuff going to affect my tank?

The ingredients of the soil are as follows:
Total Nitrogen - 0.21%(0.12% ammoniacal nitrogen & 0.09% nitrate nitrogen) Available Phosphate - 0.07% Soluable Potash - 0.14%.

I tested my Nitrates Amonia and PH about 20 minutes after I cleaned it all out of the sump. Nitrate 20ppm, Ammonia 0, PH 8.2. Not sure if the 20ppm nitrate is from the soil or not as I have been putting off doing a water change for over 2 weeks. I have chaeto/macroalgae in the sump and it’s supposed to help remove the nitrates. Any help would be greatly appreciated. I am going to do a 20% water change tonight once I pick up some salt.

I have 2 small chromis, 2 small clowns, lawnmower blenny, cleaner shrimp, 2 peppermint shrimp, and a pistol shrimp that resides in the sump. 80lbs of sand, 75lbs of LR. All sand and rock was cured for at least 3 years before it made it to my tank. My tank is currently six months old. I have about 30 different corals, mostly softies and couple pieces of LPS and SPS. Please Help.
I have a bag of chemi pure (which is a high grad carbon) in my sump and its about a month old. Supposed to last 6 months. I will pick up a fresh bag to add to it.