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Aaron, I use a pH 6.5 buffer solution, simply because I don`t know how rapidly the pH would change. I appreciate that pH isn`t as significant as people think, but a virtually instantaneous change may well harm my fish. I am just hedging my bets a little. Dave.

viewtopic.php?f=20&t=69 Dave.

CO2 Supplier: Oxford Welding Supplies. Location: Freeland Gardens, Wroslyn Road, freeland, Witney, Oxfordshire, OX29 8AQ. Tel: 0199 3882832. Service: £59 for an 83cm pub cylinder and £30 to refill it.

CO2 Supplier: Russell Gas. Location: 5 Bankhead Crossway North, Edinburgh, EH11 4BZ. Tel: 0131 4536500. Service: £12 for 7kg of CO2.

CO2 Supplier: Wildwoods Water Gardens. Location: Theobalds Park Road, Crews Hill, Enfield, Middlesex, EN2 9BP. Tel: 0208 3660243. Service: They will refill most cylinders there and then for £10.

CO2 Supplier: Ocean Commotion. Location: 210 Clarendon Park Road, Leicester. Tel: 0116 2448382. Service: £16 for 2kg of CO2. There is a one week turn round for a refill, operating from Tuesday - Tuesday.

CO2 Supplier: Maidenhead Aquatics. Location: Wyevale Garden Centre, Postland Road, Crowland, Peterborough PE6 0JB. Tel: 01733 211956. Service: £10 - £15 to refill a 500g JBL cylinder. Phone ahead to make sure they have a cylinder to swap.

CO2 Supplier: Bryland Fire Protection ltd. Location: Unit 3, Peartree Lane, Dudley, W. Midlands, DY2 0QY. tel. 01384 573301. Service: They charge £25 for a full 3kg cylinder and £30 for a full 5kg cylinder. A 3kg refill costs £5.20.