It's honor to receive praise.
What kind of filter do you use?
What tempterature do you keep them?
How many fish do you have per tank?
Is it ok to combine goldfish with goby's? (people have told me better not to)
I set up 2 filter systems which became independent to one tank.
(1) from sand of a base, circulation to the outside filter.
(2) from a double sponge filter, circulation to the upper part filter tank.
The water temperature of the tank is kept by 24-27 ℃ by chiller and a heater.
(A type) The fish species only a bug eats is about 7.
Sicyopus, Lentipes and others.
(B type) Detritus and the omnivorous fish species are about 15.
Goldfish and loach and others.
(C type) The fish species which makes the alga principal food in one tank is about 50.
Stiphodon goby and Hillstreamloach(suckerloach) are half of half.
Supply of food from outside is indispensable to the fish species of the A-type.
A food from outside is also necessary to the fish species of the B-type, but the food from which a water plant and detritus are produced secondarily in the tank is also important.
There is a lot of one which doesn't accept a direct food from outside in the fish species of C-type.
The alga(Aufwuchs) produced in the tank is indispensable to them.
Metabolism discharge matter of fishes is needed as nourishment for multiplication of algae.
Supply of these nutriment changes with the total number of the fish and the total weight in the tank.
Continuous supply of Nitrate(NO3), Phosphate(PO4) and Carbonate(CO3) is necessary for multiplication of an alga.
When it's low in fish, the fertilizer is also lacking.
The vast surface area as the alga field is also necessary for production increase of an adherent alga.
I'm preparing many leaves of Anubias nana as a field of algae.
Much light energy is also more indispensable.
Light energy is supplied from 4 direction.
It's from both sides from the back from the top.
From morning 7 o'clock to night half past 9, it's being illuminated long.
I think it's also effective sometimes to add mineral.
Water-soluable Silicate(SiO4) kinds and Water-soluable Iron(Fe) are also indispensable.
I make these up with an additive for gardening.
Montmorillonite and MENEDAEL are sometimes added.
http://www.dallasbonsai.com/store/C82-b ... lator.html
But, an alga couldn't be done in the ideal state for a short period.
The first tank changed variously over the extended period and was in the state of the adherent alga mainly.
I made a setup in order to do the 2nd tank in the similar state but it took nearly 1 year.
The beginning was covered by a soft adherent alga up.
Next entire surface can be overturned in the cyanobacteria kinds done stickily.
When that ends, one in the tank occupies in a filamentous alga, and fish can't be swum any more. I frequently had to remove.
After a filamentous alga became little, one in the water tank covers with an adherent alga of brown green.
Other algae live there and separate, and also continue a place in the tank.
The goldfish is harmless for the most part by my tank.
I think the case that an introduced goldfish is young and is still a small individual is also the cause.
They're aggressive in food catching freely, so there is a problem that a timid fish can't get food.
I always apply a feint and avoid goldfish.
At first I float large, hard bait on the surface of the water.
While goldfishs eat them, I give the fish of the low-rise building bait.
Hi Stiphodon fancier!
A fascinating picture of Stiphodon goby and a video could be taken, so it's introduced.
Male of Bluemoon and male of Orangefin were fighting intensely.
Youtube video clip
I am not used to English. Therefore,It is likely to sometimes misunderstand it.