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20 Dec 2017 01:11 #31 by robert
Replied by robert on topic New project
Further to a previous post i have infact emptied the bigger tank on the upper shelf and painted the back pain of glass the result is a much better colour blue . The flowerhorn in this tank is called Frank and he certainly is quite a charachter. The platium angel have spawned yesterday iin there new bigger tank . The two small tank just have a couple of goldfish in them just to keep the filters going , hopfuuly i will just have to turn the heaters on and then use them for raising angel fish fry , if we ever get that far . Am looking at some way of plumbing a hot 4 cold water suppy in for doind water changes . Usi g buckets at present and its a bit of a pain . So any ideas would be great

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22 Dec 2017 20:24 #32 by Bill
Replied by Bill on topic New project
I would suggest it is because in one tank there is only water between your paint and the lights while the other has water and glass between the paint and your lights. It's an optical illusion. If you had a way of aiming the lights a bit more directly at the background it will show up blue. The light that is reaching the floor-underlay is more scattered and reflected, possibly too much to actually light the blue background. You also have some air between the background and glass and some of the light is bouncing back and forth between the glass and background. The result is that your tank lights can't bring the blue forward through the glass and it looks black.
With the aquarium lights off this effect is reduced and the incidental light is coming into the tank directly toward your background. If you can't aim your light a wee bit towards the background then you might be able to move your light, forward a bit, beyond the centre line.
Another reason could be the paint. If it's a gloss, then it's reflecting even more and absorbing very little light; the result is it will look black.
It's very difficult to put into writing so I hope you can understand me :) I've seen similar results with those backgrounds you buy. If they are glossy and not fully up against the glass they vary in shade and colour and in some cases can have black patches where it is a few mm from the glass.
Bill

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22 Dec 2017 21:01 #33 by robert
Replied by robert on topic New project
Hi Bill i totally understand what you are saying and indeed think you are correct , i have since emptied the tank and painted the back pain , cant believe the difference really shows off the colours off the flowerhorn . Thanks for your imput

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26 Dec 2017 16:09 #34 by Bill
Replied by Bill on topic New project
Glad you're sorted :)

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