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Did you mean that the new water you just mixed had low PH? Or the 40g was still low after adding new water? Either way, don't panic, the worst thing you can do is start changing lots of water, (well, not the worst thing.) but if you adjust the PH too rapidly it will stress the fish even further.
I would change out 10 or 15 gallons to begin to correct the PH and then find out why it is too low. What are your calcium and alkalinity levels at? Do you use buffers or additives at all?
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THE BARQUARIUM:
55 gallon cube - 50 lbs LR - ASM G3 skimmer - 30 Gallon sump - 22 Gallon refugium / frag tank - 4x 24 watt HO T5's - Mag 9.5 return - Pin Point PH monitor - 400 watt XM 20K MH in Lumenarc reflector - Dual stage GFO/NO3 media reactor - 6 stage RODI auto top up -Wavemaster Pro running 3 Koralia 2's.
Fully stocked with fish, corals and usually some fine scotch
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