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OK well I run a spray bar now on the back wall of the tank, but I have it just above the surface as the goldfish seemed to like the amount of air bubbles it introduced. I've just checked and the heater I have is an Interpet Delta therm 300watt, it's the one I got when I bought the tank as a...

Thanks for the help so far. :) Substrate wise I don't know how deep I should have it. I have about 2" of gravel in right now which the goldfish move around a lot. But that's not taking up any of the 15" of water depth I'm talking about as I've excluded that in my measurements.

The tank I've got is about 35"x15"x15"( water height if I take into account substrate etc ) I'd need to do a water test for the PH again but I remember it being high 7's when I tested it originally when we got the goldfish.

Yes I've got a testing kit, forget which make but it's a liquid kit that I bought to keep tabs on the tank originally.

Thanks for the comments. I'll check but I think the heater is a 150w one, I've never needed it with the goldfish. I've been told the mollys like the water slightly slaty and so they might not be the best fish to keep with the rest. A friend into tropicals told me he'd not have Mollys and would...

Hi, Just joined up to get some more info and advice about moving from the current goldfish to some tropicals in our tank. Background is we moved into a new house where the previous owners had koi carp and a massively deep pond. We have a toddler so filled the pond in, but when draining the...