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My first marine tank was around 1984 or so, and like yours was driven by an under gravel filter with powerheads. Those were the good daysThe reason I won't operate without a mechanical filter:
Back in 1989 when I first ventured into marine fish, things were very different in this country to what they are now. My water company for example dosed the water with PH stabilizer so that shampoo frothed when you washed your hair, influenced by a company called Gibbs who insisted the water should be at a PH of 7.2.
RO systems didn't exist back then and the fish shops didn't supply it either and there was no way you could get tap water above 7.4 no matter what you did. My first tank had sea water in it which I filtered myself.
The filtration system consisted of an undergravel tray covered in coral sand with two tubes, one at either end with a power head on each causing a downdraft into the water pulling all unspent food and detritis into the coral sand. This coral sand became a nitrate factory and although I never lost a fish-ever, I lost a nem through a combination of poor lighting and poor water quality. This was upsetting to me and a swore I'd never turn a tank into a living toilet ever again. That's how it has to be.

Back then, if you disturbed the sewage works in the sand bed with any cleaning device - get ready for a cloudy day in the tank because those powerheads were slow man.My first marine tank was around 1984 or so, and like yours was driven by an under gravel filter with powerheads. Those were the good days
Nitrate has to get really, really high to harm fish, but my tanks back then were algae factories for sure, so I'm familiar with dirty sand beds, and I agree it's like a cat litter box for fish![]()

Yup, no technology to produce the correct spectrum. A reef bed at 30 feet is mostly blues, indigo with a small amount of UV. Back then the fish were subjected to more UV than a sunbed machine at 20 inches, it was cooking em. My nem lived a year but once it had to deal with sewage too, it lost the will to live.We just didn't have the light technology back then, short of halides, which I got into sometime later. But back then I just had as many of the old like T12 florescent bulbs as I could across the tank![]()
The tech has come a long way, especially with lighting. Newer LED lights can grow just about anything these days, it's quite a bit different than all those years agoYup, no technology to produce the correct spectrum. A reef bed at 30 feet is mostly blues, indigo with a small amount of UV. Back then the fish were subjected to more UV than a sunbed machine at 20 inches, it was cooking em. My nem lived a year but once it had to deal with sewage too, it lost the will to live.
I said back then I'd ever have another marine because we weren't in the ball park with anything. After reading for weeks how it is now, It gave me more confidence in technology.

Well I've been reading and watching video's for 5 weeks solid while building the tank system step by step. So far I've spent £600 to upgrade from fresh water to marine which is about $800 and that's just moderate equipment.The tech has come a long way, especially with lighting. Newer LED lights can grow just about anything these days, it's quite a bit different than all those years ago![]()