From www.fishbase.org/Country/CountrySearchList.cfm?Country=144&Group=freshwater
Freshwater pipefish Ichthyocampus carce
Max. size: 15.0 cm
Distribution: Indo-West Pacific: west coast of India to Indonesia.
Biology: Inhabits relatively still waters (Ref. 12693). Most frequently found in rivers, streams and estuaries. Ovoviviparous (Ref. 205). The male carries the eggs in a brood pouch which is found under the tail (Ref. 205). Males maybe brooding at 7.8 cm SL (Ref. 5316). Feeds on worms, crustaceans and small zooplankton.
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Freshwater, Short-tailed pipefish, Microphis brachyurus brachyurus
Max. size: 22.0 cm SL
Distribution: Asia and Oceania: Sri Lanka, southern India, Nicobar Islands and eastward to Japan and the Society Islands Records from Puerto Rico and USA need confirmation. Africa: east coast from Kenya south to Natal area. Also Madagascar and Mauritius (Ref. 7248). Africa: Côte d'Ivoire (Ref. 272). Western Atlantic: Atlantic coast of Florida, Bahamas, northern and southern Gulf of Mexico, Antilles, central and south American coasts to Brazil (Ref. 26938).
Occurs in relatively shallow (25-150 cm), still to slow-flowing water (Ref. 6028). Inhabits freshwater streams, rivers and estuaries. Juveniles and subadults are usually found in estuaries while adults are found upstream in freshwater areas. Feeds on worms, crustaceans and zooplankton. Ovoviviparous (Ref. 205). The male carries the eggs in a brood pouch which is found under the tail (Ref. 205). Not seen in markets (Ref. 12693
Yah, so it does not say anything about pH, tmperature or hardness but hey-it's a start! I hope this helps.