Ive moved my guppys and a smallish gourami into a 70l,put my two mollys and four platies plus 15 cardinals into my rio 350l,now my rio 180l is empty ready to house my two comet goldfish that r about 3-4in long they are currently in a clearseal 70l with a 305 ext held togather with a belt,so im gona take the three baskets of bio balls out and put them into the juwel internal which i upgraded to the 1000 pump ready for the goldfish,few questions now- can i leave most the water left over in the rio from when the tropicals was in there,i will add the 70l of water from the clearseal with the goldys,so i just remove heater and let temp drop to same as other tank then top up with 70l and add goldys and filter media?,also ive got loads of plants in the rio they might aswell stay in there as my clowns would destroy them so may plants survive at 18-19.c thats the pretty constant room tank temp,







