don't worry about that... you don't have one of those.would my river murry cod be killing them over night ?
I have mollys guppies angles
fish are as follows : 2 guppies small ,angel 1 small ,gouramis 1 small , rainbows 6 med , rainbow shark small 1, black neon tetras 2, red eye tetras 6
oh and 3 swordstails and 3 phatys
What is the roof made of? Generally speaking, the rain water used for aquariums should NOT be coming off a roof. Collecting it from direct fall is safe, but coming off a roof, it's going to collect particulates at best, and chemicals that you can't test for at worst.
Normally I agree but the nitrogenous waste from just 11 small fish in over 2,000 gallons of water is not going to register on the test kits available to hobbyists. That is A LOT of dilution power.A River Murray Cod is a predator, so it's possible.
To clarify, you said you got all 0s on your ammonia, nitrite, and nitrate tests. Is that correct? If so, something is wrong.
Not necessarily. The nitrate may be reading 0 ppm, but they may actually be so low that they are not able to be registered by the API kit which is only able to go as low as 5 ppm. The OP has a lot of water and a very light stocking right now.additionally, if there are no readings for nitrates (being at 0), the tank is uncycled.